Bookmarks not working in Python script

I'm trying to use the following Python script to sync two different directories.
The source is a local folder (On My iPhone), the destination is an app folder on iCloud (technically Resilio Sync).

```
from dirsync import sync

sync("~RBackups", "~OBackups", "sync")
```

I get the following error:

```
Traceback (most recent call last):
File "/private/var/mobile/Library/Mobile Documents/iCloud~is~workflow~my~workflows/Documents/Synchron/synchron.py", line 3, in
sync("~RBackups", "~OBackups", "sync")
File "/var/mobile/Containers/Data/Application/CBAF2231-285D-4486-982C-81681F954B5B/Library/lib/python3.11/site-packages/dirsync/run.py", line 15, in sync
copier = Syncer(sourcedir, targetdir, action, **options)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/var/mobile/Containers/Data/Application/CBAF2231-285D-4486-982C-81681F954B5B/Library/lib/python3.11/site-packages/dirsync/syncer.py", line 107, in __init__
raise ValueError("Error: Source directory does not exist.")
ValueError: Error: Source directory does not exist.
```

How do I address file paths in two different sections of the system?