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"I can't import photos from my gallery. When i import its always says failed to import."

It might be a good idea for you to start another topic for this question. If you decide not to do that, it would at least be a good idea to explain exactly what version you are using and exactly what it is you are trying to do. The more details you can provide, the more likely it is for you to receive some constructive suggestions.

"How do I upload photos from my d3400 to lightroom?"

For the topics for your message you have indicated Android. That would seem to indicate that you are wanting to upload photos to your Android device. Is that the case?

I can't import photos from my gallery. When i import its always says failed to import. 😪