I DON’T UNDERSTAND!?

I PURCHSED THIS APP AND 3 OTHERS A WHILE AGO. I WAS ABLE TO SAVE MY PICS IN JPG FORMAT, THEN AFTER A FEW MONTHS OR SO I WASN’T ABLE TO. NOW IT SAYS I HAVE TO PAY 4.99 ON TOP OF THE $17.99 I ALREADY PAID?! I DON’T UNDERSTAND WHY I HAVE TO PAY MORE? AND IF I PAY THE $4.99 MORE IF I HAVE TO PAY THAT EVERY TIME I WANT TO SAVE MY PICTURES?

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