AutoCAD drawing files (.dwg) can be accessed after it is encrypted with Atakama by simply double-clicking on the file and approving the related secure action in the mobile app on your smartphone. If you have additional files that are linked to the drawing files via OLE (Object Linking & Embedding), you will need to approve secure actions to open each linked file. If there are more than several files linked to the drawing file, you can start a session to auto approve opening these files.
In addition, AutoCAD stores all recently opened files in their start menu and will open them upon launch. This will generate a secure action for each file listed in the "Recent" section. You can start a session to facilitate this process or remove all files in the "Recent" section by editing the Registry, as shown in this article.