Error: NotImplementedError("This backend doesn't support absolute paths.")

[KipSigei]

Environmental Information

Production, Stage

• Onadata version:
  v3.0.3

Problem description

The following exception is being thrown when uploading a form with external choices

File "/srv/onadata/./onadata/apps/viewer/models/data_dictionary.py", line 246, in set_object_permissions
    f = sheet_to_csv(instance.xls, "external_choices")
  File "/srv/onadata/./onadata/apps/viewer/models/data_dictionary.py", line 76, in sheet_to_csv
    workbook = openpyxl.load_workbook(xls_content.path)
  File "/usr/local/lib/python3.9/dist-packages/django/db/models/fields/files.py", line 59, in path
    return self.storage.path(self.name)
  File "/usr/local/lib/python3.9/dist-packages/django/core/files/storage.py", line 128, in path
    raise NotImplementedError("This backend doesn't support absolute paths.")

Expected behavior

• The external choices form should upload successfully

Steps to reproduce the behavior

• Try uploading any xlsx form that has external choices

Additional Information

Logs, related issues, weird / out of place occurrences, local settings, possible approach to solving this...