Categorization: unable to import categories in Brave and Edge browser

TypeError: Cannot read property 'files' of undefined. See dev console (F12) and/or server logs for more info.

When i try to import categories in firefox, it happens without any problem. But with brave and Edge, I get the above error, with console error as

TypeError: Cannot read property 'files' of undefined
at a.<anonymous> (CategorizationSettings.vue:91)
at c (runtime.js:45)
at Generator._invoke (runtime.js:274)
at Generator.S.forEach.t.<computed> [as next] (runtime.js:97)
at r (asyncToGenerator.js:3)
at s (asyncToGenerator.js:25)
at asyncToGenerator.js:32
at new Promise (<anonymous>)
at a.<anonymous> (asyncToGenerator.js:21)
at a.e (CategorizationSettings.vue:87)

Thanks for reporting!
This feature is only available in nightly builds, I have now fixed it on aw-webui master, it was an easy fix.