Hello @TonyYoung 

you could send reciepts diretly to a Teams channel via E-Mail attachment, all attachments are saved to a folder within the files library in that channel.

To get the E-Mail address from a channel, right click it > get email address > send an E-Mail to that channel with an attachment. This mail will show up as a new thread, the attachment is also in there and in the files tab.

You could make the channel address available via address book or create a PowerApp/Flow for that, there are several ways to achieve that in the end :)

Kind regards
Michael

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