mashme.io allows you to store any type of file in a virtual room.
Currently, you can as well collaboratively share (main article) files with the extensions:
.PDF / .JPG / .PNG / .BMP / .MP3 / .MP4
In addition, all documents derived from tools such as Google Drive (Documents, Maps, Drawings, ...), Polls and Recordings are stored and can be open collaboratively.
The files, as long as they are visible, are also public to anyone who has access to the room.