When adding attachments to your Brain, the default behavior is to simply add a shortcut to the attachment and display the path located on your machine. If you want to have access to any attachments via TheBrain Cloud Services or another machine after syncing, you need to store your attachments internally.
You can make this the default behavior by navigating to (Options > Preferences > UI) and make sure the option 'On drag and drop of files) is set to "Move dropped files".
If you don't want this to be the default behavior, you can also achieve this by pressing CTRL+Drag & Drop (on a PC) or OPT+Drag & Drop (on a Mac). This will keep your file in its original location, but also save an internal copy in your Brain database.
More information on this feature can be found in our Adding Files and Web Pages tutorial: (http://www.thebrain.com/support/tutorials/files-and-email/files-and-web).
I hope this helps.
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