The transfer from Legacy 8 to FH6 worked for most categories of data. I had to edit the Legacy GEDCOM 5.5.1 file slightly to point it at the correct location for the media, and to change "1 CHR" to "1 BAPM" (I'm fussy about Baptism - "Christening" doesn't fit with my theology, but that's another story).
HOWEVER .... NONE of the marriage Media have been assigned to the couples. Baptism, birth certificates, death certificates, census images and the like are fine, but Marriage certificate images don't appear.
If I go to the Media list in FH6, the marriage images are all there. They are shown as (for example):

If I click "Links" and click on the +, I see this:

- but the Media image does not appear against either husband or wife, nor does it appear in the Marriage field for the couple. The very few early entries where I linked the marriage certificate to each spouse separately are OK.
If I go to the Marriage event in the Focus window, I can then create a link to the relevant Media file, so the capability is there.
However, with several hundred Media files that were all carefully linked already, I'm not keen on spending hours doing each one manually.
I tried ticking the blank boxes against the individual names of husband and wife in the second image above, but that didn't work.
The marriages in question transferred without any problem from FTM2012 to Legacy 8 in March this year.
I tried exporting again from Legacy into FH6, in various formats, but in no case did the marriage media attach to the marriages.











