Automatically generate md file



I have tried to synchronize my file in google drive. I found StackEdit generate a file (file 1) without extension. Then I try to export file to md file (file 2), and 2 files are the same.

Why StackEdit does not automatically generate md extension when synchronizing ?

The file2 easily imported into another markdown software (Obsidian, Typora, …). Any body have solution for this issue, teach me.