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just so I undestand , you like to replace the grid with a lookup control ? That would make the relationship one-to-one ? Am i right?
if that's the case, the behavior would be slightly different from a regular lookup . For exemple , no unsaved change would be triggered since the databwould be saved from an api background call make sense?!
Customer support service by UserEcho
it would only show the related files/folders on the current record?