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Doing a v10 upgrade. There are some "blocks" that require hand balling by the editor. Just testing a few bits for them - one that that's annoying me is if I highlight and c + p from the RTE it pastes everything, keeps the h2 tags but strips any spans with other custom classes. 

Is there a way to stop this?

Ive tried amending the config by adding to appsettings.json

"RichTextEditor": {
  "ValidElements": ....

}

changing the default value to 
...,span[class|align|style]...    I'll be honest I'm not quite following what's going on this.

If I'm copy and pasting RTE content I always open up both the Code views and use them. HTH