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The Distribution of Users’ Computer Skills: Worse Than You Think (2016)
(www.nngroup.com)
This is a most excellent place for technology news and articles.
I'm not saying it's "trivial" I'm saying you shouldn't need a 3rd party service to accomplish it.
Bluetooth isn't "trivial" but the core OS does it just fine. File ops should be the same.
Edit The params discussed were listed above. Send a pdf from phone to laptop.
The medium of connection and communication should be transparently selected. The source and destination should be transparently revealed.