How to handle big attachments in Zoho Desk

How to handle big attachments in Zoho Desk

Hi,

in our daily business it can be, that we have to deal with files bigger than 20 MB.
Is there a easy way to implement Zoho Workdrive or OneDrive in Zoho Desk and give the end customer without big effort the possibility to upload their files.
E.g. if a ticket is created by mail or the portal, create a shared folder, send the link to the customer and store the link automatically in the ticket?

Furthermore is there a possibility in Zoho Workdrive, that an external user can edit a shared folder without registration?

Thanks in advance.

BR