HI Jona ,
It's possible that the azure function may fail because of the limitaion with the request size 100 mb .
What you can do is :
1 - if you want to investigate more , you can activate Functions diagnostics and check the logs or event you can check stream logs : https://learn.microsoft.com/en-us/azure/azure-functions/streaming-logs?wt.mc_id=MVP_328341&tabs=azure-portal
2- if you want to go faster you can go and switch to the Prenium Plan or a dedicated APP service plan :
https://learn.microsoft.com/en-us/azure/azure-functions/dedicated-plan?wt.mc_id=MVP_328341
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