You can use our 'Convert PDF to Images' automation for this. It will take files from the Input Field (PDFs) and export each page into a separate image file in the Output Field (Images).
Set up the automation
Create the Convert PDF to Images automation, then select your Airtable base and table.
Prepare an attachment field containing the original PDFs and a different attachment field for the images.
Choose the originals under Input Field (PDFs) and the destination under Output Field (Images).
Limit the run to a view containing one or two sample records, then run the automation. Check the output attachments. Each PDF page is saved as a separate JPEG image, so a multi-page PDF produces multiple files.
Before processing more records, review the existing-data handling setting, especially if your output field already contains files.