The old DM-yourself technique. Classic ๐ค
Discussion
I didn't have signal installed on my windows machine so this seemed easiest ... and doesn't have to leave my network :D
I do this a lot with Signal Note to Self ๐
And if it's too large (I try to respect the cost of running the service even if it will go through on Signal), Syncthing or Filen. The cost of Syncthing and Filen is completely on me so I feel better about using them for anything that is larger than text.