With file attachments, you can share additional information that will help your team to visually understand your ideas. Sharing videos, voice recordings, screenshots, and photos will make your messages more effective and clear.
Attach Files to Messages¶
You can attach files to messages in the following ways:
Use the attachment icon - select the paperclip icon inside the message input box
Drag and drop
Paste from the clipboard
Preview File Attachments¶
Mattermost has a built-in file previewer that you can use to:
Share public links
Select the thumbnail of an attached file to open it in the file previewer.
You can download an attached file by selecting the download icon next to the file thumbnail.
The following media formats are supported on most browsers:
Images: BMP, GIF, JPG, JPEG, PNG, SVG
Audio: MP3, M4A
Files: PDF, TXT
Other document previews (such as Word, Excel, or PPT) are not yet supported.
Attachment Limits and Sizes¶
Up to five files can be attached per post.
The default maximum file size is 100 MB, but this can be changed by the System Admin.
Image files can be a maximum size of 6048 pixels x 4032 pixels, or 24 MP (mega pixels), or a raw image file size of approximately 36 MB.