When I upload a large amount of data to my test container, I execute the update container code and prompt: RTS error: Cannot grow memory
Canisters currently have a hard limit of 12 (or was it 8?) GB of stable storage and 4GB of non-stable storage. It sounds to me like you’re hitting one of those limits. The typical solution for this is to scale out into multiple canisters to store all that data.
https://www.canscale.dev/ could be of interest to you.