Certain mods such as Sophisticated Storage add storages that Cloud Storage can't use, seems to be an incompatibility. I think it would be beneficial to add a config option or datapack option for specifying extra blocks that can be used as containers.

For reference, here is Sophisticated Storage's GitHub:
https://github.com/P3pp3rF1y/SophisticatedStorage

I also created an issue on their GitHub incase they can add compatibility from their side somehow:
P3pp3rF1y/SophisticatedStorage#305