[BUG] Azure.AI.Projects.OpenAI: uploaded PDF file fails to parse in vector store; MPFD issue? #55350
Description
Library name and version
Azure.AI.Projects.OpenAI 1.0.0-beta.4
Describe the bug
There's a combination of .NET-specific exacerbation and service brittleness involved that needs to be root-caused:
Uploading a .pdf file with purpose=assistants succeeds, but then attempting to index it via creating a vector store fails. Fetching the vector store file (/vector_stores/{id}/files) retrieves a last error of "failed to parse."
This doesn't repro against OpenAI's endpoint; it also doesn't repro against Foundry when using a .txt file instead of .pdf. Curl also doesn't appear to reproduce the problem.
- OpenAI working and Foundry not working implies a service parity issue
- .NET not working when other languages and curl do implies a .NET-specific issue
- Previous problems like this have related to multipart/form-data (MPFD) content handling in fields
Expected behavior
If I can upload a file and index it with OpenAI's /files and /vector_stores APIs, I should be able to do it with Foundry's.
Actual behavior
I can't.
Reproduction Steps
See description.
Environment
No response