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Open the console in Chrome Devtools and see if any errors pop up in the console.
Also check your log provider for warnings / errors.
Can you show your configurations done for TinyMCE. It should be under a SiteInitialization Module. Looks like this -
services.Configure<TinyMceConfiguration>(config =>
Additionally, Did you find any errors in log files?
If you look in source Source Code of the TinyMCE instance you might some leads as well.
Hi,
Regards,
Anuprita