Can't upload new Artwork on existing link

[GC-Cengage]

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Describe the bug
Once a link is created, you can't seem to re-upload new artwork into the same link. It continues to display the old artwork, even if you clear your caché.
Usually I upload artwork from In5, which provides me with files 'Assets' & 'Index.html'. These files get loaded onto Cyberduck, to display an interactive design online. If i need to make any design amends, I have to keep changing links which is becoming a massive issue.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Log Files
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Additional context
(https://brochure.cengage.uk/Catalogue/CUI/)