First test I did: convert a workdisk with two demo files (small BASIC sample programs from the Oric Atmos manual) saved from my Oric Atmos using my Cumana Reborn.
See workdisk.zip containing the .hfe image and the result of the export to Oric DSK which does not seem to work. Do not have an original DSK for this as this one was created on my original Oric Atmos hardware and the Cumana Reborn. Second test I did to confirm with an image where I know that the original DSK does work in Oricutron, the Space 1999 game (hope Dbug as author does not mind...)
See Space1999.zip containing original DSK, converted HFE image that does work via the Cumana Reborn on my Oric Atmos and finally the image converted back from HFE to DSK using the export to Oric DSK. Which does not work in Oricutron.
Also note the filesize from the image converted back to DSK differs from the original DSK.