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I checked again how Omero (talking about 5.0) Insight behaves when
1) importing generated OME-tiff
2) exporting it back form Omero to disk as OME-tiff, by using "Export as OME-tiff" option
As Will said, the uploading to Omero takes seconds (image is about 150M).
If one uses "Export as OME-tiff" on this imported image, the Description field is preserved in the resulting OME-tiff file - as needed.
However, this Description of imported image isn't displayed by Insight in the Description window (on the right).
The problem with new version of Bioformats is still there, - I generate OME-tiffs using old version of "loci_tools". The new one seemingly misses "getOMEXML" function.
Thanks,
Y.