Data Commons upload error

To get around file size limitations for up/download to TDAI, Data Commons, large files can be split into smaller files. E.g. a 5GB file called dummyfile_5GB.txt can be split into 100MB chunks with:

split -b 100M dummyfile_5GB.txt dummyfile_5GB_part_
mkdir dummyfile_5GB_parts
mv dummyfile_5GB_part_* dummyfile_5GB_parts

then upload the directory containing the split file parts to Data Commons:

dva upload dummyfile_5GB_parts <doi> --url https://datacommons.tdai.osu.edu/ # with API token as env variable

(the original file's md5 checksum should also be uploaded)

After a dataset consumer downloads, this could be rejoined into the original file with cat dummyfile_5GB_part_* > dummyfile_5GB.txt, and a checksum could be calculated and compared.

In a test, this led to the following uninformative error after 2 parts had been uploaded:

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "C:\Users\thompson.4509\AppData\Local\miniconda3\envs\data-commons-tests\Scripts\dva.exe\__main__.py", line 7, in <module>
  File "C:\Users\thompson.4509\AppData\Local\miniconda3\envs\data-commons-tests\Lib\site-packages\dva\cli.py", line 93, in main
    cli()
  File "C:\Users\thompson.4509\AppData\Local\miniconda3\envs\data-commons-tests\Lib\site-packages\click\core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\thompson.4509\AppData\Local\miniconda3\envs\data-commons-tests\Lib\site-packages\click\core.py", line 1055, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "C:\Users\thompson.4509\AppData\Local\miniconda3\envs\data-commons-tests\Lib\site-packages\click\core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\thompson.4509\AppData\Local\miniconda3\envs\data-commons-tests\Lib\site-packages\click\core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\thompson.4509\AppData\Local\miniconda3\envs\data-commons-tests\Lib\site-packages\click\core.py", line 760, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\thompson.4509\AppData\Local\miniconda3\envs\data-commons-tests\Lib\site-packages\dva\cli.py", line 74, in upload
    api.upload_file(doi, path)
  File "C:\Users\thompson.4509\AppData\Local\miniconda3\envs\data-commons-tests\Lib\site-packages\dva\api.py", line 67, in upload_file
    raise APIException(f"Uploading failed with status {status}.")
dva.api.APIException: Uploading failed with status ERROR.

Reproduce the split-file upload with the documented dva upload command, then start at the upload entry point in dva/cli.py and upload_file in dva/api.py. Trace how the API's ERROR status is handled and make the failure identify the cause rather than reporting only a generic status.