How is my .fig file 54 MB after using downsize/ tiny img

I used the downsize and tiny png plugins to reduce the size of my photos significantly (example screenshot attached). When exporting the .fig file it’s still 54 MB, which sounds crazy and it’s making my prototype crash every 20 seconds on mobile.

Am I missing something here? Do these plugins not actually purge the data from the file? Any tips on what to do?