Hi @MikeLee-7640 ,
I Couldn't find anything on the limits of these functions. On the other hand as these are basically functions it would be independent of Data size fed to it , but larger the payload the time taken by the function might increase. 1 MB file shouldn't be any problem to the function actions or the execution limit. Did you try with 1MB payload ? Can you try it once ?
Best Regards,
Suraj Revankar