Nervermind, the error was indeed coming from the standard cloudformation for wordpress proposed by AWS.
reinstalling from a Bitnami AMI and everything works correctly from the start.
Sorry for the false alert and good learning for anyone who setup a wordpress with AWS standard wordpress package.
issue /closed
I changed the allocated memory, but I still have the issue to have the data saved.
for example the team member input still don’t get saved.
Any help will be welcome