Drag and drop with custom type identifier doesn't work

Question

I\'m trying to achieve drag and drop on macOS with a custom type identifier to avoid collisions but it doesn\'t seem to work. First, here\'s a working example with a pub

Answer 1

The typeIdentifier in above is not just a unique string, it must be UTI.

If you want to use some custom-application-specifc UTI (think twice if you really need it), then you have to register one according to Apple rules, starting from

<key>UTExportedTypeDeclarations</key>
        <array>
            <dict>
                <key>UTTypeIdentifier</key>
                <string>com.procrastin8.plzwork</string>
                ...

in app Info.plist

See details specifically in Declaring New Uniform Type Identifiers

And wide collection in Technical Q&A QA1796