Hi @ltxlouis
please don’t use Zeebe as storage system. It is not intended and not recommended to handle such big messages. We already have found issues with the current defaults, see for example this https://github.com/zeebe-io/zeebe/issues/4249
I would suggest that you store the data somewhere else, in a system which is intended to to handel such big data like mongo db or elastic etc. You can then use a key or id to reference the data and use zeebe only for orchestrating your services.
If you still want it, then yes you need to change the maxMessageSize.
Greets
Chris