Lite subscription holders can upload file sizes up to 1GB, Professional subscription holders can upload file sizes up to 4GB, and Enterprise subscription holders can upload file sizes up to whatever suits their needs.
Guest accounts have an maximum file upload size of 100MB.
In the case that a license holder shares a channel with guests, the same file size limits apply to guests as they do for license holders when uploading into a channel. For example if your subscription file size limit is 10GB, then your guest can also upload 10GB into your channels.
However, it is important to note that guests can must upload files into a channel. If they upload files into the files panel on the left hand size of the screen then the files are limited to 100MB each.
Although there are limits on the size of individual files that you upload, all accounts have unlimited storage.