If you don't have a network connection, you can setup an adhoc hotspot on any Android 9+ (Settings > Network & internet > Hotspot & tethering https://support.go

If you don't have a network connection, you can setup an adhoc hotspot on any Android 9+ (Settings > Network & internet > Hotspot & tethering https://support.google.com/android/answer/9059108 https://support.google.com/android/answer/9059108) or iPhone (Settings > Personal Hotspot), then connect to it using any WiFi-enabled device. A useful filesharing utility that a friend wrote is https://github.com/akovacs/uploadserver https://github.com/akovacs/uploadserver - it's basically a nicer version of: python -m http.server 8000 Download prebuilt binaries for Linux, Windows, Mac OS from https://github.com/akovacs/uploadserver/releases/ https://github.com/akovacs/uploadserver/releases/ or install from source if you prefer Determine your machine's IP address using: # Linux hostname -I # Mac ifconfig # Windows ipconfig Start the file server, and then navigate to it using the web browser of your choice on any device connected to the WiFi network (no need for a client application). chmod +x upload_server ./upload_server Navigate to the server's ip address (indicated by the hostname -I command you ran earlier) port 8000 in the browser of your choice and upload files using the web UI or directly via curl: curl -X POST --data-binary @file_to_upload.txt http://192.168.1.X:8000/uploaded_file.txt Then download the file to another machine or mobile device either from your web browser or via a commandline tool: curl http://192.168.1.X:8000/uploads/uploaded_file.txt --output downloaded_file.txt