Hello,
I'm pretty new to this game and have a problem that I'm hoping someone on here is able to help with.
I'm struggling to get my solder to flow.

This is my process, tools and materials:
Join is tight and fits well. Piece is clean. Flux is applied.
Solder wire piece is applied-I have tried hammered and as is. (Is definitely solder)
I have heated the ring evenly-I have tried many methods including placing the solder underneath (trying to draw it up the join).
I have tried soldering on a soldering brick and tried held In a third arm.

The solder just won't melt or flow.

I have a LPG set up. I'm wondering if this is the problem?
I have a 2L gas tank, primus regulator (one pressure gauge), primus hose and torch. I have tried the larger torch head and a precision one, which I have been told would be perfect for smaller jewellery making.

I would greatly appreciate any advice.