My extension needs to allow users to upload pdfs and then programmatically open those PDFs.
However, I want to do this without transmitting the PDFs from the user's computer. (And correspondingly without needing to send them back to their computer).
Is there any way at all to do this? I know that there is a strong need to restrict access to local files. Perhaps this is somehow achievable with some very sandboxed directory? Somehow saving the files into the directory's local folder?
Relatedly what is the purpose of the match pattern for files? see here