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Good to hear from you again, and thanks for your report.
The PNG file standard does not include support for IPTC metadata. PNG files can contain EXIF metadata and XMP metadata; MLA provides access to these metadata elements.
You can see what metadata MLA is able to access from the Media/Edit Media screen for the item. Scroll down to the “Attachment File Metadata” text area towards the bottom of the screen. Perhaps you can find an alternate source of the Title you want. If you can’t find what you need, post a link to the file and I will investigate further.
I am marking this topic resolved, but please update it if you have problems or further questions regarding the above suggestions. Thanks for your continued interest in the plugin.