I am unable to upload files with specific suffixes in CIS

My CIS version is CIS-2024_beta-12.3.8104. I found that its file rating function cannot upload certain types of files (whether suspicious files are automatically uploaded or manually uploaded).
For example, I can upload exe/dll, but I cannot upload files in xlsx/csv format.
May I ask if it is Comodo’s server side that restricts file uploads or if my local bug is causing the inability to upload?