Extension format not accepted in upper case

[ldemarchis]

When loading a .PDF file, using the split/embed functionality, it is not accepted by the sandbox. Here's a code snippet example:

2025-Jan-16 13:48:36 - INFO - (modules.split): Writing Local File /tmp/tmpqesssar8/William Shakespeare.PDF
2025-Jan-16 13:48:36 - INFO - (modules.split): Loading Agatha Christie.PDF (145201 bytes)
2025-Jan-16 13:48:36 - ERROR - (modules.split): Un-supported file extension: PDF
2025-Jan-16 13:48:36 - ERROR - (chunk_embed): Operation Failed: cannot access local variable 'loader' where it is not associated with a value
Traceback (most recent call last):
File "/opt/oracle/home/oaim-sandbox/app/src/content/split_embed.py", line 406, in main
split_docos, _ = split.load_and_split_documents(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/oracle/home/oaim-sandbox/app/src/modules/split.py", line 171, in load_and_split_documents
loaded_doc = loader.load()
^^^^^^
UnboundLocalError: cannot access local variable 'loader' where it is not associated with a value

To solve