I find it useful when I have to ask for files from another person without having to ask them to install the app.
Trebleshot has this option(screenshot attached) and I'm currently using it. But it's source seems to archived, so looking for an alternative if it exists.
Is android nearby share enough for this? Generally, I think that foss apps give me faster transfer speeds overy nearby share. Or is it just placebo?
It sounds like you just want a generic file hosting website. Does it need to have an app on your end? At most, you need an account on that website to ensure your the only recipient. If you dont need that though something like mega should be fine.
I was looking for an app for file transfer using a local network(hotspot, wifi etc)
Hmm. There's qrcp but thats desktop to mobile. Something like that for android....
curl --upload-file thefile.tgz https://transfer.sh/somename
Then paste the resulting URL to the person who wants the file. Another useful app is the magic wormhole and I think there are some web front-ends for it.
Proton drive gives you 1GB for free and you can share files using a link. They can view and download the files with the link, plus you can set it to expire and password protect it. You'd have to start deleting older files to share new ones, but 200GB is quite cheap if need be.