Exception report on export page(s) (e.g. too long filename) add page name to log - maybe have a truncation rule as well.

[jasonjac2]

Problem to Solve

Experimenting with exporting section to markdown (in preparation for a request to be able to export notebooks to MD on request / continuously).
Selected a section with 210 pages.
Export progress seemed stuck
clicked on it and got an error about filename length
went to log, found error - no clue as to which page caused the problem.

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New Feature/Solution

Provide a clear and concise description of what you want to happen.

1. Add better logging / exception handling to say which page failed to export
   And / Or

2. have an option to cap filenames to x chars (maybe including a pagename hash at the end to give uniqueness).