Hello @TheresaBehenna ,
The system that the third-generation editor (3GE) was made in will no longer available to us, therefore transition to the cross-device/platform editor (CPE) that's been available for the past several years is necessary. Not all functionalities from the 3GE builder will translate over to the CPE, either because those functionalities are or will become defunct.
Based on what was provided in your most recent case's notes, it sounds like the majority of your issues stem from certain campaigns built in the defunct 3GE builder from being able to copy into the CPE. Ultimately, if some of these campaigns aren't compatible with the CPE, they'll need to be manually recreated, which our phone support teams can assist with for live, 1:1 guidance.
I'd also recommend referring to the following articles in our Knowledge Base - also available via the Help tab in your account - for general info on the handful of differences between the two systems, and using the CPE in general:
If you have specific feedback regarding the CPE's functionalities, make sure to check out our Community's Ideas board, upvote topics you're interested in, or create posts that detail the desire for a specific functionality. Make sure to keep our Community Guidelines in mind when posting, and include as much relevant, constructive detail as possible for the use cases on the desired functionalities.
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William A
Community & Social Media Support