Upload field adds file extension after save and reopen

[erikjanwestendorp]

Which Umbraco Forms version are you using? (Please write the exact version, example: 13.4.0)

13.5.0

Which Umbraco version are you using? (Please write the exact version, example: 13.5.2)

13.7.2

Issue summary

After saving an upload field, I reopen the same upload field, and suddenly a file extension has been added (XSLX).

20250916-0645-42.7433674.mp4

Specifics

No response

Steps to reproduce

Create a form, add an upload field, save it and open the upload field again.

Expected result / actual result

No response

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This item has been added to our backlog AB#56744

[rickbutterfield]

Hi @erikjanwestendorp, thanks for raising this issue! I have managed to replicate it and will add it to our backlog to be worked on.