I took a few posts from the export xml file from my site which is wordpress version 2.5. I copied and pasted the post I needed for my other site which is version 2.7 and save as .xml file.
Then I click import on my wordpress site and click upload
and it shows “Invalid File
Please upload a valid WXR (WordPress eXtended RSS) export file.”
The file format is .xml
My file basically shows
<item>
<title>Blah Blah</title>
<link>https://example.com/?p=4037</link>
<Blah Blah
</item>
I am trying to importing few items to the new wordpress version