Getting Started
Why can't I open file:// links?
Trello attachments work one of two ways: by either uploading a copy of the file to our servers (for attachments added from your computer or mobile device) or by linking to an attachment on another service’s servers (for URL attachments, Dropbox attachments, etc.).
Currently, Trello does not allow attaching local files without them being uploaded to Trello’s servers. This means that shared drive attachments, attachments stored on an FTP server, and other local file storage options can’t be used with Trello without uploading those files to Trello’s servers. As a result, additional changes made to the file in your local shared drive won’t be reflected in Trello.
If you need a file stored in a local file sharing service to reflect changes that you make to it, there are a few options.
Use a cloud storage system
Trello does support file attachments from Google Drive, OneDrive, and Dropbox. If you have access to those services, you can upload your file there. Since those Trello attachments work as links, the attached file will always link to the most recent version in the cloud storage solution you’re using.
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