Importing files such as .mcpack or .mcworld not being opened by Minecraft pocket edition the bedrock version.
Related issues
Attachments
Comments

Thank you for your report!
We're tracking this issue in MCPE-140165, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

Ok. But how can I fix the issue

Ok but how do I fix it
@unknown on the linked ticket:
What you can do is to use a file explorer that supports the file extensions and import the files that way, like a CX File Explorer.