I have this problem also with Windows, it's one of the two purposes for which I made https://dro.pm. If it's too large for email or there's no email client installed, I wouldn't know for the life of me how to copy things on Windows without spending >5 minutes setting up shared folders, firewalling, and then undoing the changes when done. Uploading to a website and typing over a very short link is done in ten seconds
Not as convenient if you want to copy a large number of files and don't want to zip them all, but in most cases I just want to transfer one file or link or command (text) and this is still my go-to solution more than a decade after I made it, works on all OSes with either a command line or a visual browser. Beat that, airdrop / nearby share / Huawei share.
Cool service, probably shouldn't be used for anything you don't want to be public. The URLs seem to change incrementally, and https://dro.pm/g is self referential for that reason, probably. You can go letter by letter to look at various thicks people share.
Yes, I'm hoping that's obvious as it'll be inherent to such easy-to-use links, though the site has such low traffic and I know from access logs that nobody is guessing these links in an automated fashion, that a few seconds of exposure are almost negligible, depending on what it is you're posting.
If the links were unguessable (or had a password option, as has been proposed many times), you'd also lose much of the convenience. But unguessable links is an option if you use the second tab, effectively the same as a password.
Especially if you use "delete after opening", the custom link can be extremely short-lived (no one will guess that in time) and you got an indicator of compromise as well. (I personally trust this enough for ID cards and passwords, but of course that's with the benefit of being the owner and knowing all of the above plus that there is no secret logging.)
Fwiw, I also like the "social network" effect so far. I've discovered interesting things on dro.pm by looking at what people use my service for. Currently, /q has an interesting youtube video that I wanted to continue watching on my phone for example :)
Not as convenient if you want to copy a large number of files and don't want to zip them all, but in most cases I just want to transfer one file or link or command (text) and this is still my go-to solution more than a decade after I made it, works on all OSes with either a command line or a visual browser. Beat that, airdrop / nearby share / Huawei share.