Hey !
Welcome here, don't worry for your english, it's quite good.
I'm glad you want to share your files !
You can wrap them in an archive file, then upload directly on the website.
Follow the "Dépôt de fichiers" up there, and you'll be able to upload any files you want (150MB max per file).
For the scans, just remember to scan first in 600dpi, then decrease to 300dpi when saving in jpg (without compression).
Thank you !