minimal nip-96 file server behind tor
you can install this easily on android phone using termux
this example server is running on android phone
upload with curl
curl --socks5-hostname 127.0.0.1:9050 -X POST -H "Content-Type: multipart/form-data" -F "file=@test.txt" http://s6mn26rvxxoiezkh43e42on4nsnj2etpkvy7pjkj4rgpv7n5n4gjgqyd.onion/upload