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I just noticed that not all icons in the dock allows you to drag files to them. For example, I can drag a file to textedit but not finder. What exactly is it that decides whether or not an application supports an action like that? Just curious.
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If you want to change trackpad dragging behavior by turning drag lock on or off, visit System Preferences > Accessibility > Pointer Control > Mouse & Trackpad > Trackpad Options. Check the box beside Enable dragging and choose with drag lock or without drag lock from the drop-down menu.
If drag and drop works in Safe mode, it's likely that the problem was caused by a system extension or login item. To find out which, restart your Mac normally. If drag and drop doesn't work, the issue is a system extension or login item. And it's much more likely to be a third-party login item than a system extension.
Open Apple Menu and Select System Preferences. This time select Accessibility and click on Pointer Control. If you are on an older version of macOS, click Mouse & Trackpad. Click Trackpad Options and check to Enable dragging and select three-finger drag and click OK.
I believe it's the list of supported file types set in the application's Info.plist. If you drag a supported file type onto the app, it will allow the drop. Otherwise it will not.
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