I needed to fix image column titles of the sheet (5 columns) to get image gallery working properly.
Then I went checking on the builder side, that all image upload fields would still be available in app’s ‘edit’ and ‘add new’ pages.
So I noticed that the first one of those upload components in ‘add new’ page had been re-linked to some other field of my sheet. So, if I hadn’t check this, next image uploads would have gone to wrong field.
I’m 99.99 % sure that it was ok before, as I had just added and tested uploading with them, and then noticed gallery don’t work without a fix to those column names. And I think I have seen this earlier too. Might be good to check.