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For this to work, you need a fairly recent version.



Drop all images onto a web page.
Check the order is right in the Page and Layer gallery.
Select all:

Web Properties > Image > Web...

Aeron, PNG cannot hold a sequence of images, the others do.

Can you explain the end purpose as there are other approaches that may be possible.

There is an PNG extension, animated PNG, ...

Place each set of 70 images into a separate folder.
In Xara go to the Fills gallery > Disc fills > Image Folder and accept the index question (this creates a sub-folder of Thumbnails).
All the...