You can upload all kind of content to Notes, Issues and even comments. Every user who has access to a project can see all the content that is attached to any item within that project. If you upload file A to a Issue A, it will be attached to that Issue and remain in the file management system of WordPress even if the Issue is deleted (that way you won’t accidentally delete important files). See below for more on how to delete unused files.
File size limit
You might run into trouble uploading a large file. This is not a bug or anything – it simply has to do with either your WordPress install or the server you are running the site on. There is an article over at wpmudev’s blog to help you out on this: Increase memory limit. (note: while we check the quality of the sites we link, we are not responsible for their content).
Uploads won’t be deleted when you close or delete an item associated with it. The upload will remain accessible through the backend. If you want to quickly delete those uploaded files that belong to items that were already closed or deleted simply use one of the many free plugins available. As of writing we use the free “Media Cleaner” by MeowApps. It will automatically delete files not connected to any item in your projects.