You can check if your Gerber files are created correctly by using software called GC-prevue. This is a free Gerber viewer that can be downloaded from its website
1. Silkscreen top
2. Layout solder side
3. Solder mask solder side
4. Drill info
5. Drill info (txt)
6. Silkscreen bottom (optional)
7. Mill info (optional)
8. Peel off info (optional)
1. Silkscreen top
2. Layout top side
3. Solder mask top side
4. Layout solder side
5. Solder mask solder side
6. Drill info
7. Drill info (txt)
8. Silkscreen bottom (optional)
9. Mill info (optional)
10. Peel off info (optional)
1. Silkscreen top
2. Layout top side
3. Solder mask top side
4. Layout inner layer 1
5. Layout inner layer 2
6. Layout solder side
7. Solder mask solder side
8. Drill info
9. Drill info (txt)
10. Silkscreen bottom (optional)
11. Mill info (optional)
12. Peel off info (optional)