I can't save my analysis, it says that the PNG must contain exactly one game

I can't save my analysis because i should make more moves, but i've added up to 24 moves and it still doesn't let me save

Hmm. Could you post a copy here?

I have found that it doesn't like pgn's with FEN notation included.

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]

1. Nf3 {[%c_effect f3;square;f3;type;Book]} 1... c5 2. c4 Nf6 3. b3!? Nc6 4. Bb2
d5 5. cxd5 Nxd5 6. Nc3! e5!? (6... Bg4 7. e3 e6 (7... Ndb4 8. Qb1! e6 9. a3 Nd5
10. Qc2 ⩲) 8. Nxd5!? Qxd5 (8... exd5?! 9. Be2 ±) 9. Bc4 Qd6 10. O-O Be7 11. h3!
Bf5 (11... Bh5 12. Bxg7 Rg8 13. Bc3 ⩲) 12. d4 ⩲) 7. e3 Nc7 (7... Ndb4?! 8. Qb1!
Be6 9. a3 Nd5 10. Bc4! ↑) (7... f6 8. Nxd5 Qxd5 9. Bc4 Qd6 (9... Qe4 10. Rc1
Qg4! 11. O-O e4 12. Ne1 Qxd1 13. Rxd1 ↑) 10. d4! cxd4 11. exd4 Bg4 (11... exd4?!
12. Nxd4 ±) 12. O-O →) (7... Be6 8. Nxd5 Qxd5 9. Ng5! ↑) 8. Rc1! b6 (8... f6 9.
Ne4! Qd5 (9... b6?! 10. d4 ±) 10. Qc2 Nb4 11. Qb1 Nxa2 12. Bc4 Qc6 13. Qxa2!
(13. Nxf6+ gxf6 14. Qxa2 ⩲) 13... Qxe4 14. O-O ±) 9. b4!! Bb7 (9... cxb4? 10.
Nb5! +-) 10. bxc5 Bxc5 11. Ne4! ± Be7?! 12. Nxe5 Nxe5 13. Bxe5 Bxe4 14. Qa4+ +-
Qd7 15. Qxd7+ Kxd7 16. Rxc7+ Kd8 17. Rc4 f5 18. f3 Bb7 19. Kf2 Bf6 20. Bxf6+
gxf6 21. Bd3 Rc8 22. Ra4 {[%c_effect a4;square;a4;type;BestMove][%c_arrow
c4a4;color;#96be46;opacity;0.95;from;c4;to;a4][%c_square
c4;color;#9eba5a;opacity;0.5;square;c4,a4;color;#9eba5a;opacity;0.5;square;a4]}
22... a5 {[%c_effect a5;square;a5;type;Good][%c_arrow
a7a6;color;#96be46;opacity;0.95;from;a7;to;a6][%c_square
a7;color;#96af8b;opacity;0.5;square;a7,a5;color;#96af8b;opacity;0.5;square;a5]}
*

It appears to have loaded correctly but doesn't seem to be at the end of the game.

Is something missing?

Well, the opening theory I analyzed wasn't a whole game so that's why. But I found the solution to my problem. Ending the analysis with the "+-" notation prevented me from saving and removing it allowed me to save the analysis