Ok, after installing mobile drivers on the pc I was able to get the dev tools running.
The only javascript errors are as follows;
This error shows on all themes tested, but doesn’t seem specific to the image add/delete actions;
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The specified value “!” does not conform to the required format. The format is “#rrggbb” where rr, gg, bb are two-digit hexadecimal numbers.
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When tapping or swiping with the pc simulator within devtools these 2 errors are shown. If the phone is the only input device used, these errors do not show (none are shown other than the 1st above);
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Handling of ‘touchstart’ input event was delayed for 2147483647 ms due to main thread being busy. Consider marking event handler as ‘passive’ to make the page more responive.
Handling of ‘touchmove’ input event was delayed for 2147483647 ms due to main thread being busy. Consider marking event handler as ‘passive’ to make the page more responive.
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There are no errors shown that occur specifically during add or delete image actions.
I hope this helps.