I Built a Tool That Lets Teachers Write Once and Teach Every Class

Every day, teachers repeat the same process.
They solve a math problem on the board for one class, erase it, then rewrite the exact same solution for the next section. The explanation changes, but the writing doesn't.
While building PasteDB, I started wondering:
What if teachers only had to write it once?
The idea is simple:
Write the solution on the board once.
Capture it as an image or digital note.
Upload it.
Open the same page in every classroom using the projector.
Spend time explaining instead of rewriting.
I'm exploring how a developer-focused paste sharing platform can also become a lightweight classroom teaching tool.
I'd love feedback from teachers and developers—would something like this actually be useful?
See here https://pastedb.netlify.app