Try different path within emoji.txt

src/freedombone-app-pleroma

     fi
 
     if ! grep -q "${shortcode}," $image_filename; then
-        echo "${shortcode}, ${image_filename}" >> $PLEROMA_DIR/config/emoji.txt
+        echo "${shortcode}, /custom_emoji/${shortcode}.${image_extension}" >> $PLEROMA_DIR/config/emoji.txt
     else
-        sed -i "s|${shortcode},.*|${shortcode}, ${image_filename}|g" $PLEROMA_DIR/config/emoji.txt
+        sed -i "s|${shortcode},.*|${shortcode}, /custom_emoji/${shortcode}.${image_extension}|g" $PLEROMA_DIR/config/emoji.txt
     fi
 
     chown -R pleroma:pleroma $PLEROMA_DIR