Hello,
could you please verify the integrity of the game cache to check that all game files are in order:

1. Open Steam.
2. From the Library section, right-click on "Arma 3" and select Properties from the menu.
3. Select the Local files tab and click the Verify integrity of game cache... button.
4. Steam will verify the game's files - this process may take several minutes.

Also could you please upload the generated file to some file-sharing service (Google Drive, DropBox, OneDrive, Wikisend, etc...) and share the link?

You should be also able to upload ZIP files right into this ticket. Simple take the ZIP file with the generated files and drag&drop it into the comment box.

Hi BisWizard,

Ran verification and 27 files failed to verify and were downloaded. After that, the game ran perfectly fine.

If you want I can still send over the report in a dropbox (but not sure if it's unnecessary now since it works). It kept failing on here.