That’s unpleasant and makes even harder to isolate what causes this.
Thanks for catching a bug. You can now upload .zip files Insert file.zip (806 Bytes) and insert images
Be sure to wait a few seconds after selecting the file for it to show in the dialog. before uploading
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Due to current workload, I haven’t had chance to play with it more. I think your expression works well. The different results I got from my experiment may due to I wasn’t using factor of 60 for scrolling duration, I can’t remember for sure. So as long as scrolling duration is factor of 60, then the expression should work as expected in 1.8.1.