You can show a screen shot of the Gallery items.
Put the Datasource or YourTable on the Items property of the Gallery.
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RESULT RESPONSE: Are you asking me to provide data on this message board? I don't know what I can provide to you. I don't think my specific application is the problem but I will capture screen shots of what the DataSource selection for my gallery "looks" like. As you can see the FORM provides a dropdown selection for a DataSource and the GALLERY does not provide that dropdown. The Gallery does not not allow access to the DataSource selection. As a reminder, I am interested in knowing the proper screen selections in order to change the datasource for an existing gallery.
Just helping @eka24 here - you need to tag the responder in your post - it makes it much easier to see.
There is no DataSource of a Gallery - it is the Items property that controls it. Yours appears valid (there are no errors on it), but controls need to be set to ThisItem.FieldName (actual field name you need to see).
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Features releasing from October 2020 through March 2021