You can create shortcuts or pointers in Google Drive, allowing files to be stored in one folder, but be accessible from any other folder in Google Drive or Shared Drives.
You can add a shortcut to a shared document to your own My Drive folder for easier access:
Click on Shared with Me on the left-hand side of the screen
Select the document you wish to add to your My Drive folder
Click on the Add a shortcut to Drive button
Choose the folder you wish to add the shortcut to in My Drive
Click on Add Shortcut
The document will stay in the Shared with Me folder, but a shortcut will be added to your My Drive, which can be moved into any folder of your choice.
If you delete a shortcut to a shared document from your Drive that was shared with you, the document won’t be deleted but will simply be removed from your Drive view. You can restore the shortcut by finding it in the Shared with Me folder and adding it to your Drive again.
You can add an entire folder that has been shared with you into your own My Drive folder:
Click on Shared with Me on the left-hand side of the screen
Select the folder you wish to add to your My Drive folder
Click on the Add a shortcut to Drive button
Choose the folder in My Drive you wish to add the folder to
Click on Add Shortcut