I know from the start that this is related with Difficulties / Bugs with Canvas but i have a new version of kibana ( 7.11.1) and I still encounter this issue with canvas:
The server gave a response that the workpad data was too large. This usually means uploaded image assets that are too large for Kibana or a proxy. Try removing some assets in the asset manager.
Is there any possibility to increase the workpad space ? or fix this if it is a bug ?