Adding external sources and email services lets the user search the documents stored in another system or in the cloud, as well as email texts and attachments. You can add a source under «Uploads» and «Profile».
To add a source to File.one and start uploading files, use the source added to «Uploads». If you simply want to add or remove a source, then that can be done under «Profile».
By adding a local computer you'll be able to search all the files located on your PC.