Import data into url field not working

Import data into url field not working

Thought I had this working in my early testing, but now it's not. Our application compiles customer orders. New daily orders will be collected first on an Excel spreadsheet. Then employees will use the import data function. One field on the sheet is a link to a PDF of their order. I created a new field in our app as URL. When I import data, the link info appears in the correct field in the preview. When I complete the import, however, the URL field is empty. If I then edit the record and copy/paste from Excel to the app, it works fine. How can I troubleshoot this?