I keeping getting a message that file name is too long

From here: https://help.dropbox.com/syncing-uploads/files-not-syncing

Max character length

Windows only allows file and folder names of 260 characters or less. On top of this limit, certain applications—such as Microsoft Excel—have shorter limits (218 characters).

Note that Windows counts the file path as part of the name, so the sample file path below would be 142 characters, not 16:

C:\Users\Panda\My Documents\Dropbox\Creative Nonfiction\My Autobiography\Favorite Things\Favorite Foods\Bamboo\Family Recipes\Fresh Leaves.doc

Versions 3.0 and higher of the Dropbox desktop application are able to read and write to locations that are longer than 260 characters long without problems. However, some applications might still be subject to the Operating System limits and may have problems accessing files that are in long paths.

For example, if you have an Excel 2010 file in a path that is 260 characters long, Dropbox will sync it to your computer but when you try to open it Excel will show an error message like "File Cannot be accessed". You can read more about Office and Microsoft path limitations on their Help Center. In general, all you need to do to open those files is to shorten the name or move the file or folder to a higher-level folder.