You received a PDF with a fax-style cover sheet on page 1 and the actual document from page 2. You need just the document, not the cover.
Flint by range splits this in one step.
Range split is the trick
Open split PDF, drop the file, switch to range mode. Type '1, 2-' (the cover, then everything from page 2 onwards). Two files come out: 'cover.pdf' and 'document.pdf'. You can rename them sensibly during or after download.
Or just delete the cover
If you don't need the cover at all, skip splitting and use delete PDF pages to remove page 1. The result is the document without a cover, in one file, in one step. Simpler than split when you don't need the cover preserved separately.
Replace the cover
Need to swap their cover for yours? Delete page 1, then merge your new cover as the first file with the body second. Net effect: clean document with your cover on top.
When cover spans multiple pages
Some cover sections are multiple pages (title + contents + copyright). Adjust the range accordingly — '1-3, 4-' for a three-page cover. Check the thumbnails to confirm the split happens where you think it does.
FAQ
What if I need cover + first content page together?
Adjust the range: '1-2, 3-' instead of '1, 2-'.
Will splitting damage the original?
No. The source PDF is unchanged. Outputs are new files.
Can I split AND delete cover in one go?
Split keeps everything in some output. To eliminate the cover, use delete pages instead.
What about a back-page disclaimer?
Same approach in reverse: range '1-N, N+1' splits off the last page.
Cover off, document on its own. Split after the cover.