I want to allow users to choose a folder to upload an image to.
I have everthing hard-coded at present and working fine for a single destination folder, but need to give Powerapps users a way to choose a folder from the set of available ones in the library.
Any ideas on how this can be done?
Have you looked at EXPORT/IMPORT -> http://www.c-sharpcorner.com/article/import-and-export-data-in-microsoft-powerapps/
Are you trying to upload documents to SharePoint library via PowerApps?
Currently, PowerApps supports for SharePoint list but not library.
So I am afraid we are not able to add documents to library via PowerApps.
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Features releasing from October 2019 through March 2020