Originally Posted by barry
If I download a file in MOBI, it seems to become a PRC file. That is fine if the Metada is correct. However, If I edit the Metadata, then send to device (Kindle), the changes do not appear on the kindle. If I reformat into MOBI after the changes, it displays properly on the Kindle. What am I doing wrong: it seems it should not be a two step process.
The file does not support setting the metadata. This is an issue with the PRC/MOBI file itself. You can always change the metadata within calibre but those changes are only written to the file (if possible) when sending to device or saving to disk.