Below if my flow, which partially works. It will update files from email, but it puts the content of the attachment from one file in all three documents. I receive three emails with .csv attachments that I want it to move/update in Dropbox separately. I've tried some other copy file overwrite flows, but can't get them to work either.
On New Email - processes the new email appropriately from Outlook.
Condition - Apply To Each
Drop Box - Update File 1
File - /filename1.csv
File Content - Attachements Content
Drop Box - Update File 2
File - /filename2.csv
File Content - Attachements Content
Drop Box - Update File 3
File - /filename3.csv
File Content - Attachements Content