@AvianDecosta you could add all your libraries into a single collection and then display that collection in a Gallery.
1. Add all Libraries as a datasource
2. Use ClearCollect(colCombinedLibraries,library1,library2,....) to get all items in a single collection
You could then use the Distinct() function to populate the distinct plant values for your filter dropdown.
On the Gallery use Filter(colCombinedLibraries,plant = dropdown.Selected.Result)
(could be that is dropdown.Selected.Value - can 't test this currently)
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