Digital Marvel comics borrow the visual habits of pamphlet covers: corner boxes, character bursts, foil-like treatments, and artist signatures stacked over the title logo. Those marks help a collector file a cover. They are not the first panel of the story.
When you open a file, pause on the cover for thirty seconds, write the cover artist, then turn to page one on purpose. If two files share interiors but not covers, they are still one story for reading purposes. Variant collecting can be a separate hobby; mixing it with reading is how beginners lose the plot.
If a marketplace thumbnail crops away the credit box, look at the full cover once in a viewer such as Veve or another tool you already use. Then return to the interiors. Literacy starts after the packaging.