Looks low mid range priced Asian to me - the tell: stamped steel fork crown, swagged seat stay tops and inch sized main tubes.

What's the diameter of the seatpost? That's somewhat of an indicator of the seat tube wall thickness and the quality of the tubing.

Here's a suggestion of the areas of a bike to photograph to get more than guess responses.
Edit: I looked over your photos again and you've already done this.


Chas.