You are facing two separate issues:
- Save shows 403 error
This indicates that the server is blocking the save request. This is a server-level restriction (firewall, security module, or permission issue), not an SP Page Builder issue.
- 500 error during export
This error is coming from SP Page Builder content inside modules.
Please remove the affected modules and try exporting again.
If you prefer, you can also fix the modules instead of removing them. Once done, please let me know if the issue persists or if there are any other problems.
For the Collection error
Please try the following steps:
- Open the affected page in SP Page Builder editor
- Identify any addons using Dynamic Content / Collections
- Remove and re-add those addons (or disable Dynamic Content)
- Save the page and try exporting again
Thanks