Can't Add File Column to Form in Dataverse

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Posted on by pp365

439 Season of Giving Solutions 2025

Hi everyone,

I have created a custom table in Dataverse and added a File column. I have saved and published all customisations. The file column is greyed out in the table.

I went to add the column to the Form for the Table, so I can then use a Model Driven App to add a file upload feature (as featured on Reza's video, here: https://youtu.be/RGJrUkgh_NU?feature=shared&t=149). However, the name of the File field is not showing up as a selectable table column on the left rail when editing the Form.

The table is set up to use attachments.

I have researched online and other reports of this issue are relating to having to save the record before a file upload is possible, but I can't get to that step: I can't even select the File column to be added to the Form, which is a prerequisite for this to be available in the Model Driven App.

Update: I tried adding another File column in the same table. I got the same result. It is greyed out in the table and is not selectable in the Form view from the left rail. I have attached an image to show the file column and that it's absent from the selectable columns.

Second Update: I have tried accessing the table via a Flow in the same solution and environment. Essentially the same problem: the field representing the File is not appearing in the 'Update a Row' action in Flow. There must be a problem with the column itself which is making it read only (as with the GUID column for example), as it's not showing in any of the places I've looked so far to allow it to be updated.

Any help on this would be much appreciated, thank you!

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Building Power Apps

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pp365 439 Season of Giving Solutions 2025 on at

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I have continued to review this issue myself and have provided two updates on the original post, but have not got to a resolution. Any help with this would be very much appreciated, thank you.

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Parvez Ghumra 1,579 Moderator on at

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@pp365 I have just tested this and am having the same experience, I'm unable to add columns of type File to a Model Driven App main form.

Strangely, if I review a pre-existing main form in the designer where I have a field of type File already on the form, I can see that it's still there, but I cannot add the same or different column of type File to the form. To me this feels like a bug in the form designer. I suggest you raise it as a support request with Microsoft.

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john3parker 6 on at

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@pp365 I'm having the same issue with model driven apps in a "sandbox" Environment with Dataverse. I can't see or add a File column type to any forms. I tested this in a "developer" Environment and it seems to work ok, but the File column is automagically added to the form. If I select to see all columns the File column is not displayed.
I agree with @parvezghumra this appears to be a bug in the form designer and should be raised up to Microsoft as a defect.

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pp365 439 Season of Giving Solutions 2025 on at

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Hi everyone, thank you very much @parvezghumra and @john3parker for your help and replies. We are raising with Microsoft as a fault and will update the thread when there is an update.

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Hilla 8 on at

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I am experiencing the same issue, I can't add any existing file columns to the form right now.

However, while troubleshooting, I learned that if I add a new file column directly from the form editor, it shows up and I can add it to the form. So if you are building something from scratch right now, try this!

Edit to add: These file field columns also disappear from the list as soon as you exist the form editor.

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Parvez Ghumra 1,579 Moderator on at

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@Hilla Thanks. This works as a workaround for any columns you are creating from scratch. But the moment you navigate away from the form designer and then go back into it again, any existing File columns on the table are not displayed in the selection pane in the form designer.

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Parvez Ghumra 1,579 Moderator on at

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@pp365 @Hilla @john3parker I've just spoken to Microsoft support who confirmed that this is a known issue affecting all regions globally. They are planning to roll out a fix in the next few days and have confirmed the suggested workaround above

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Hilla 8 on at

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Thanks! I realized I wasn't clear enough in my original post. I edited that for clarity.

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pp365 439 Season of Giving Solutions 2025 on at

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Thanks again to all that have responded to this thread and @parvezghumra for raising this to Microsoft and receiving formal confirmation that this an accepted fault.

I will aim to update this thread again when I have noted that the resulting fix has been applied to our tenant (note that the fix will appear at different times in different tenants globally).

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Javier-M-G 8 on at

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Another confirmation and workaround from Microsoft:

Thank you for contacting Microsoft Support, my name is *** and I'm the Support Engineer that will assist you on this Support Case.

This is a known issue that according to the last information I got is going to be fixed on the update during this weekend.

As a mitigation you have this plan:

1.   First click on the view when you open the table and add the field to "Show existing column":

2.   After this click on "Update forms and views"

a) select the required file field column,
b) and the view and form to be applied,
c) finally click "update" to save.

3.   After that,
a) go to your designer page, and you can see it on the form page with existing "file" data type field.

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