Hi Julian,
Just to clarify, when you say "exported", do you mean you publish the file (using Publish Locally)? And when you say "import", were you trying to open the published file in GWD?
Published file cannot be opened for edit in GWD, you need to edit the original source file and then republish.
Just wonder if you see any error when you open the source file of your ad? What did the error message say? Would you like to send your source file to
gwd-s...@google.com so that we can take a look?
Thanks,
Emily (GWD Team)