Problem/Motivation
In D8's core/modules/file/src/Plugin/Field/FieldType/FileItem.php and D7's modules/file/file.field.inc uses textfield's default '#maxlength' => 128. On Drupal.org, we want more than that, #1246118: Allow uploading of videos (screencasts) to d.o.
Before screenshot

Proposed resolution
Increase the file field widget allowed extensions setting input to 256.
After screenshot

Remaining tasks
| Task | Novice task? | Contributor instructions | Complete? |
|---|---|---|---|
| Add automated tests | Yes | Instructions | |
| Manually test the patch | Novice | Instructions | |
| Embed before and after screenshots in the issue summary | Novice | Instructions | |
| Review patch to ensure that it fixes the issue, stays within scope, is properly documented, and follows coding standards | Instructions |
User interface changes
API changes
Original report by @drumm
In D8's core/modules/file/src/Plugin/Field/FieldType/FileItem.php and D7's modules/file/file.field.inc uses textfield's default '#maxlength' => 128. On Drupal.org, we want more than that, #1246118: Allow uploading of videos (screencasts) to d.o.