User questions, download and how to share files with someone else

[slrslr]

I have found this project and i was interested how Fission Drive can be used. Found: https://guide.fission.codes/drive/preview which says i can use it for public hosting of my files.

Per the image below it seems one have to know the hash of other person "drive", i can not just search all people drives for certain file name, right?

So if i will decide to share 1GB of .pdf files, i have to tell other party to download fission drive (Windows, Linux download links not yet available) and tell them my hash?

When i share that .pdf files, will it cause any substantial additional disk space used having such active share (my Fission drive app must be non stop running)?