Is there any other subscription that allow large size file to store as Cloud Storage.
Unfortunately, the current limitation is permanent and there's no other subscription plan with a larger "per file" limit.
Nonetheless, Todoist always recognizes URLs and you can upload larger files to your Google Drive and copy/paste the links to Todoist. In Wedoist, our team-based project management tool, we already offer an easy way to manage files from your Google Drive through our system and we may implement this feature also to Todoist in future updates.
David, that would be a great feature, to manage all the chapters of my books and notes files in MS word associated with research.