Hello!
I do have multiple survey using the same Feature Layer.
I have "Attach a file" in all of them.
Some of them do not allow the file attachment.
In Connect I see the attach icon available, but it is not available in mobile app both Windows and Android. Of course it is not in ReadOnly mode.
I also checked on the web form and the attachment is available.
Version 3.25 of Connect and app.
I seem not to have issues with images tough.
Any idea why? Thanks!

