We will be retiring the current One2Many functionality in the near future as a result of Flash EOL.
One2Many Beta will not need Flash for file upload if you'd like to try it out: beta.logmein.com
I expect the full release by the end of this year, once final tests have been completed.
We will be updating Central's One2Many functionality to remove the reliance on Adobe Flash to upload task resources and manage credentials. The Flash uploader will be replaced with an HTML based file uploader. The current ETA for this is the first week in December.