Admins decide which kinds of file members and guests can share: any type, anything except programs and scripts, or only the kinds you pick. Every upload is checked on the server by its name and by what's inside, so a program renamed to report.pdf is turned away. Corporate and Enterprise add always-allow and always-block lists of extensions.
For IT and security teams, and anyone who invites outside guests into channels.
For each of Files from members and Files from guests, pick what they can share: any type of file; anything except programs and scripts, which covers programs, installers, scripts, shortcuts, disk images and Office files with macros; or only the kinds you pick from documents, images, audio and video, archives, and code and data. Out of the box, members share anything and guests can't share programs and scripts. Changing a rule affects new uploads only.
Freesbe checks every upload on the server, so the rule holds in the desktop app, the browser, the API and a meeting's chat alike. The last extension counts, so invoice.pdf.exe is an .exe. Then it reads the start of the file: a Windows, Mac or Linux program, a Java or Android package, a shortcut or a disk image is recognised even when renamed to report.pdf or given no extension. When a file isn't allowed, it isn't uploaded; the person sees why, and the message can still go without it.
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On Corporate and Enterprise, list extensions separated by commas. Always allow lets people share them whatever the rule says, like dwg and step for the drawings your partners send. Always block stops them for everyone, even under any type of file, like zip. An extension on Always allow still doesn't let a program through under someone else's name. If the workspace moves off Corporate, the lists stop counting and Only the kinds I pick works like anything except programs and scripts, so nothing becomes looser.
File type rules is included in Corporate and Enterprise. Blocking programs and scripts for members or guests works on every plan; picking kinds and the lists need Corporate.
The help guide shows every screen and setting. File types
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