I don't know if I have the capability to upload it, since I don't use file-upload sites much in the first place.
You can use 'a trusted upload site', like google drive, or dropbox or anything like that. You don't need to use the 'shady' uploading sites like mega or filedropper or anything like that. And there you don't need to worry about any legal repercussions, it's not like you're uploading an entire game, you're just sharing a small part of it, which without the .exe files and all the rest of it, is completely useless, so don't worry, myself and the other people on the forum have been sharing files like this for years. And if you really want to be 'safe' then simply delete the uploaded file after a day or so, because the people who usually create these .bms scripts don't actually have the game files, so if you don't provide the game files then how are they going to be able to decipher the files and create the script that you need, ya know?
And I have parts of game files that I have uploaded 4years+ ago, which are still laying in my 'upload account', and nothing bad has ever happened, so there's really nothing to worry about, since .rar files (and any obfuscated files like .bin) don't get scanned, so there's no way for them to find out what is inside the files that you upload in anyway.