@shelleyb ,
This is what I have done to make it work.
I made a collection based on checked gallery items.
Then patched to my list (Photos) based on ID
I patched a title because it is required and passed Complete to the Status column. If you have an input for status you can use that as well or a Checkbox.value
Change Photos to your list and the details between the { } to your info.
ClearCollect(colGallerySelects,Filter(Gallery3.AllItems,Checkbox1.Value=true));
ForAll(colGallerySelects, Patch(Photos,LookUp(Photos,ID=colGallerySelects[@ID]),{Title:TextInput4.Text,Status:"Complete"}))