Issue #2884052 by zviryatko, Krzysztof Domański, alexpott, drclaw, vijaycs85,...

Issue #2884052 by zviryatko, Krzysztof Domański, alexpott, drclaw, vijaycs85, Madis, charlotte.b, mcdruid, Berdir, lauriii: Uploading a managed file on a custom form that allows multiple files also triggers the remove button which results in a duplicate temporary record and results in the file being deleted