After updating my iPhone to iOS 14.7.1 on 12.08.2021 the iPhone became much less sluggish and exhibited no more red exclamation marks when sending any message, that suddenly appeared days prior to the update. However, now DS-file app still seem to work, shows proper icona for each type of file, like before, but clicking them to preview, like e.g. a pdf, jpg or xls it either pops up a fault message stating “illegal format” or the page stays empty, rendering the app completely useless. I can download each file into the offline section of the app and from there the app actuall shows previews. But that’s not how the app behaved before: it very usefully showed all files as previews (effectively opening them for usage and being able to scroll and enlarge by pinching). Please, correct this!
Note: Both Synology Servers in use have been fully updated, all Synology add-ons as well.