The HTML5 "multiple" attribute allows multiple files to be selected and uploaded at once. In Backdrop, we should integrate this into the "managed_file" element and the File module field.
Sub-issue of https://github.com/backdrop/backdrop-issues/issues/200
This should be relatively portable from Drupal 8.
Commit: http://drupalcode.org/project/drupal.git/commit/8fd2b4779ec83c3e44a8caac... Issue: http://drupal.org/node/625958
~~PR by @docwilmot: https://github.com/backdrop/backdrop/pull/2430~~ ~~PR by @quicksketch (based on @docwilmot's): https://github.com/backdrop/backdrop/pull/3030~~ PR by @docwilmot: https://github.com/backdrop/backdrop/pull/3755
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Thanks! The site was on PHP 7.0. With assistance from my hosting provider, I updated to PHP 7.4 and now I have access to the site again. No database re-import required.
Locked out of site after updating modules
Thank you very much. I will follow your advice.
Locked out of site after updating modules
The best you can do is test and report. If you find a contrib that doesn't work in php 8.3, create an issue in its queue so it gets fixed. In my experience, I've found that 7.4 is safest...
Locked out of site after updating modules