Large files and videos are not supported.
Please type in the full address of the network file you wish to link. Ensure the file or folder is on a SHARED network drive, otherwise this attachment will not be accessible to other users. e.g. \\server\share\filename.doc or Z:\folder\filename.doc
If you are using Internet Explorer, before you link the document please add the Promapp url to the trusted sites settings from Tools > Internet Options > Security > Trusted Sites > Sites > Add, restart Internet Explorer and try the linking again
Ensure the link is a valid url. e.g. http://www.promapp.com