EXIF ( and IPTC ) data is extracted from the photofiles during import or upload.
When the photos are resized on the server, this data gets lost; this is inherent to the resizing process.
The EXIF and IPTC data is extracted and saved to wppa+ db tables at the time of upload/import IF Table IX-H7 and 8 are checked.
In Table X an XI, you will find the items that have ever been found in the photofiles on the current site.
If you did not save the data during upload/import there may be a way to recover them afterwards:
If you did NOT resize during upload ( See Table I-A2 ) OR you saved sources ( See Table IX-H1 and 2 ) you can – after ticking the boxes in IX-H7 and 8 – run the ‘recuperate’ maintenance procedure in Table VIII-A7.
If you did resize during upload AND you did not save sources, you can ftp all the originals to your wppa-depot ( See the import screen ) and run the import process ( the Ajax button ) WITH THE UPDATE PHOTOS CHECKBOX CHECKED ). You do not need to specify the albums this way, so it will not be too complex to do.
I hope this explains and can help you to find the required exif data.
Using this data is explained here: https://wppa.opajaap.nl/iptc-and-exif-data/