I would like to shift some tasks from the APIs and begin using Flow, to upload files from our NAS drive to some FTP/SFTP Sites. Can I use Flow to look to my Network and do file transfers?
Yes, it is possible to copy files between File system and the FTP service.
But there is file size limitation.
The Max Message Size under Microsoft Flow transfer is limited to 100 MB, which could be referenced under:
Limits and configuration in Microsoft Flow
For File system and the FTP connector under Microsoft Flow, please take a look at the template:
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