Hi @TysonHuotari
In my Flows, I have HTML email output which is 2500 - 3000 characters and copy and paste using the common methods no problem when required.
ctrl + c -> ctrl +v
right-click copy -> right-click paste
I can cut and paste with below methods
ctrl + x & ctrl +v
right-click cut -> right-click paste
I have also now just cut and paste over 150,000 characters of text into a "send an email v2" and it saves, sends, copys and pastes, cuts and pastes etc.
Can you possibly screen grab any errors you get and post them?
What browers have you tried, chrome, IE, Edge, Firefox, Safari?
If you create a brand new flow with a simple trigger action does the same issues occur?
Have you tired to go to Lorem Ipsum and copy 100 paragraphs. does this paste in with no other expresions in the body of the email?
Please try this and post back so we can try and identify if you are identifying a Flow Issue or a local one.
Alan