This is not the official plugin for TinyPNG. Please go to the following link for the official plugin – https://wordpress.org/plugins/tiny-compress-images/
This is a WordPress Plugin used to connect with the TinyPNG.com API and optimize/reduce the size of your PNG file on the go. Its fast and reliable.
Instructions on How to Use:
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Put in the correct email address and the TinyPNG API Key associated with it. (If you haven’t made one yet, you can visit this link to make one – https://tinypng.com/developers )
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Upload the PNG file using the uploader. As soon as the uploading finishes, the plugin will connect to the TinyPNG API and get you the Optimized image. (The files uploaded and optimized are saved in the TInyPNG folder in the main wordpress media folder. For eg – /wp-content/TinyPNG )
Note :- Because of too much work and less of time, I am not able to work on this plugin much. I asure of you testing it in all WordPress Platforms, but any updates on its features wont be possible before July. Sorry for the inconvenience.