Custom Domain - Upload, Download, & Preview Errors

Custom Domain - Upload, Download, & Preview Errors

While using the Custom Domain feature in ZohoLearn, you may experience an instance where user actions like upload, download, or preview may not work, with other functions working properly.

Since domains are different for Custom domain enabled orgs, the actions mentioned above will not work if third-party cookies are blocked. There are no other alternatives, and it is not a bug on our end. It is a known limitation and browser behavior. You will face this issue for services that support custom domain and using different domains within the product.

To solve this problem, we suggest you follow the below steps:

Step 1: Provide access to your custom domain using your Zoho Account

When the team members log in to their Zoho Learn account for the first time via the newly configured custom URL, this page will appear.

Click the Trust this website checkbox, then click GRANT ACCESS to access the ZohoLearn account through the custom domain. This one-time action will help you experience smooth and consistent ZohoLearn account usage in further sessions.

Step 2: Enable third-party cookies to your custom domain

Add this custom domain URL to the 'Always use Cookies' section of your browser cookies settings to experience seamless ZohoLearn usage.

We will explain this part with some of the popular browsers' settings for your reference.

1. Google Chrome Browser 

Follow these steps if you are using the Google Chrome browser:

1. Open a Google Chrome browser.
2. In the upper-right corner of your browser, click on the three vertical dots and select Settings.
3. On the left side of the Settings tab, select Privacy and Security, then Site Settings.
4. On the Site Settings page, scroll down to the Content section and select Cookies and site data.

5. On the Cookies and site data page, click the Add button next to Sites that can always use cookies.
6. In the Add a site text box, enter your custom domain (for example'), check the Including third-party cookies on this site checkbox, and click Add.

2. Mozilla Firefox Browser

Follow these steps if you are using the Firefox browser:
1. Open a Mozilla Firefox browser.
2. In the upper-right corner of your browser, click on the three vertical dots and select Preferences.

3. On the left side of the Settings tab, select Privacy and Security.
4. Choose the Custom option and uncheck the Cookies checkbox.

5. Click on Reload All Tabs.

3. Safari Browser

Follow these steps if you are using the Safari browser:

1. Open a Safari browser.
2. Click the Safari menu from the top toolbar.

3. Choose Preferences.
4. Click the Privacy tab.

5. Uncheck: Block all Cookies and Prevent cross-site tracking checkboxes.

4. Microsoft Edge Browser

Follow these steps if you are using the Microsoft Edge browser:

1.In the top-right corner, select the ellipses ...,then select Settings.

2. On the left section of the Settings page, select Cookies and site permissions and click Manage and delete cookies and site data.

3. On the Cookies and site data page, scroll down to the Allow section, check the Including third-party cookies on this site checkbox, and click Add button.

4. Enter your custom domain and click Add.


1. Why is it necessary to enable third-party cookies?

Say you are accessing a domain named, and within this page, another API call is triggered with the domain to upload a file. The browser will treat as a third-party domain, as it does not belong to *

2. What is the purpose of in Zoho Learn?

For a faster and enhanced upload experience, we are using different domains based on the requirement. For upload, we are using

3. How do custom domains work?

When you access the custom domain, we will add the necessary details in the cookies in both & * domain.

All major browsers block third-party cookies by default in their latest versions. Once it is enabled, cookies will not be added when we access within Our server will throw an unauthorized error, because user cookies were not added in the request.

5. Why is the issue only reproduced in the custom domain?

Without a custom domain, the ZohoLearn product will load in, and upload requests will be triggered in Both domains belong to * Browser settings will not block cookies. That's why upload is working in

To enable custom domain for your ZohoLearn account, visit our custom domain help article page.

If you are not able to solve the issue, even after following the above-mentioned steps, feel free to contact our support team for clarification.

    Zoho CRM Training Programs

    Learn how to use the best tools for sales force automation and better customer engagement from Zoho's implementation specialists.

    Zoho CRM Training
      Redefine the way you work
      with Zoho Workplace

        Zoho DataPrep Personalized Demo

        If you'd like a personalized walk-through of our data preparation tool, please request a demo and we'll be happy to show you how to get the best out of Zoho DataPrep.

        Zoho CRM Training

          Create, share, and deliver

          beautiful slides from anywhere.

          Get Started Now

            Zoho Sign now offers specialized one-on-one training for both administrators and developers.

            BOOK A SESSION

                                      You are currently viewing the help pages of Qntrl’s earlier version. Click here to view our latest version—Qntrl 3.0's help articles.

                                          Manage your brands on social media

                                            Zoho Desk Resources

                                            • Desk Community Learning Series

                                            • Digest

                                            • Functions

                                            • Meetups

                                            • Kbase

                                            • Resources

                                            • Glossary

                                            • Desk Marketplace

                                            • MVP Corner

                                            • Word of the Day

                                              Zoho Marketing Automation

                                                Zoho Sheet Resources


                                                    Zoho Forms Resources

                                                      Secure your business
                                                      communication with Zoho Mail

                                                      Mail on the move with
                                                      Zoho Mail mobile application

                                                        Stay on top of your schedule
                                                        at all times

                                                        Carry your calendar with you
                                                        Anytime, anywhere

                                                              Zoho Sign Resources

                                                                Sign, Paperless!

                                                                Sign and send business documents on the go!

                                                                Get Started Now

                                                                        Zoho TeamInbox Resources

                                                                                Zoho DataPrep Resources

                                                                                  Zoho DataPrep Demo

                                                                                  Get a personalized demo or POC

                                                                                  REGISTER NOW

                                                                                    Design. Discuss. Deliver.

                                                                                    Create visually engaging stories with Zoho Show.

                                                                                    Get Started Now

                                                                                                        • Related Articles

                                                                                                        • Custom domain

                                                                                                          By default, your hub will be accessible with the portal URL. With custom domain, you create a custom domain and map it to your hub. To create a custom domain for your hub: 1. Go to the Custom Domain tab, then click the Add Custom Domain button. 2. ...
                                                                                                        • Creating a custom domain for your portal

                                                                                                          By default, your portal will be accessible with the portal URL. With custom domain, you create a custom domain and map it to your portal. To create a custom domain for your portal: Navigate to the portal from the Custom Portal tab Go to the Custom ...
                                                                                                        • How to get started with custom portals?

                                                                                                          Custom portal allows you to create multiple external portals that you can use to share manuals and courses with external stakeholders who are not part of your hub. With your hub as the primary portal, you can create multiple secondary portals for ...
                                                                                                        • Custom portals

                                                                                                          A custom portal for your hub comes in handy when you want to create an extended platform to share information and courses with users who are not a part of your organization. These users may include partners, customers, investors, and others. Zoho ...
                                                                                                        • Custom portal add on

                                                                                                          You can include custom portal as an add-on to your existing paid plan in Zoho Learn. Depending on your needs, you can purchase users and portals in addition to the number of users and portal available in your current plan. The count of custom portal ...
                                                                                                          Wherever you are is as good as
                                                                                                          your workplace



                                                                                                            Watch comprehensive videos on features and other important topics that will help you master Zoho CRM.


                                                                                                            Download free eBooks and access a range of topics to get deeper insight on successfully using Zoho CRM.


                                                                                                            Sign up for our webinars and learn the Zoho CRM basics, from customization to sales force automation and more.

                                                                                                            CRM Tips

                                                                                                            Make the most of Zoho CRM with these useful tips.

                                                                                                              Zoho Show Resources