Quick share a easy way I mostly used to index the gallery items, which may help while you’re create a editable gird funciton or something like that.

CountRows(Split(First(Split(Concat(<GalleryItems>,Text(<GUIDField>),"|"), ThisItem.<GUIDField>)).Value, "|"))

Repalce <GalleryItems> by the data source(Collection? or something) used in Gallery Items, and replace <GUIDField> by the unique field in that data source.

Here is a example:

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