RE: when I import my file (1200 entry) the photos do not appear all
For photos to be imported the URL (link) to each photo must me fully qualified valid links. If they are not WordPress will not be able to fetch them so them can be imported.
This is an example of a fully qualified URL:
These links also need to be accessible to WordPress, if they are not, they can not be fetched and will not be attached to the entry.
RE: How to reimport the file to crush the entries and not duplicate them
I am sorry, I am not sure what you mean by “crush” them… but to import again, first export directory entries by using the Export All tool found on the Connections : Tools admin page under the Export tab.
Edit the file to include your photo images and then import the file. Importing the exported CSV file will not make duplicate entries.
Hope this helps!