To control what file types can be uploaded within your installation, you can navigate to Settings–>File Extensions
From this menu, you will be able to manage what file extensions can and cannot be uploaded by all of the users in the installation (including admins and clients). By default, there is a host of common file extensions listed, and these can be activated or deactivated as you desire, but default extensions cannot be deleted or edited.
Using the “Limit allowed extensions” dropdown at the top of the menu, you can control whether you want to use only default file extensions, or to also include custom extensions. “Limit allowed extensions” is set to “No”, then only default file extensions will be displayed and allowed to be uploaded. If this setting is set to “Yes” then you will have the option to add your own custom file extensions, as well as have the option to deactivate any of the default extensions that you don’t want to allow.
To add a new file extension, you can use the + button at the top of the table.
When adding a new file extension, you will want to enter the (generally 3-character) file extension into the “File Extension” field. For example, if you wanted to add the AVI file extension, you would add “avi” (without quotes) into the “File Extension” field. Additionally, you can use the “Make This Extension Active?” setting to determine if the newly created file extension will be active after creation (this setting can be changed after the extension is added as you desire). Once done, just click “Add” to save the new extension.
On all existing file extensions, you will have the option to set them as “Active” or “Inactive”. If a file extension is “Active”, then a user will be able to upload a file with that extension within the installation. If a file extension is “inactive”, then users will receive an error message if they attempt to upload a file with an inactive file extension.