EXPORTED FILE NO AUDIO
The raw audio is a mp4a 256kpbs, 48khz. I don't know if the format is the reason. But it works on the timeline. So, there should be no reason it won't work on the exported file.
Hi-Tech 'Ta Bai commented
I resolved this issue on my own. I made a workaround.
It seems like different audio formats won't work on Rush.
My voice track was recorded on a voice recorded on my Samsung Note 9 with 256kbps, 48khz resolution.
What i did was export the video clips with its audio.
Then, i export the voice track alone.
Then, i create another project with the two finished files above and successfully exported it with complete audio.
By the this app is not good if you're on a Rush. It keeps cRaSHing.