I get an error while saving a model in Editor: 'Something went wrong when trying to save your diagram. Please try again'
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You can get this kind of error if your model is very large. You would need to create some subprocesses to reduce the size of the diagram.
If you have access to tomcat server, you can look in the logfile for 'client intended to send too large body'.
KBA , BPI-SIG-PM-MOD-EDT , Graphical Editor for SAP Signavio Process Manager , How To