Hello.
I saw your description in carefully.
I think this issue is in Flashplayer of browser.
But HTML5 run as well in any browser.
And in 2020, Flashplayer cannot run in all browser.
I can help you for converting flash to canvas.
I have an experience in PHP, MySQL, CSS, JavaScript, Flash to HTML5.
I would like apply for this job.
Please send your message so that we can discuss your project.
Thank for reading my cover letter.