How can I browse to a file, select it and then display the full pathname of the file in another field?
If you store a reference to the file in a Container field, you can then create a separate calculation field using the formula GetAsText ( <containerFieldName> ), and the calc will show the filepath to the file referenced in the container field.
The Get Directory script step may be of some use to you.
FileMaker Pro 15 Help
For the last step there is special function
GetContainerAttribute with externalFiles
Correction. GetContainerAttribute returns metadata, which does NOT include the filepath. (See FM Help: "Returns the file metadata of the specified container field.")
On the other hand GetAsText will return the filepath for an externally referenced container object. (See FM Help: "For a container field, GetAsText returns external path information …")
There is "externalFiles" attribute to get filepath. This result is OS style filepath.
GetAsText return FM style filepath, and contain other info some case (size of inserted image etc.)
Retrieving data ...