Custom external flavours on Mac doesn't work

i did create simple site single draggable element ondrag function below:

function drag(ev) {

  ev.datatransfer.setdata("text", ev.target.id);

}

 

in indesign plugin wrote custom flavour helper class , overrided couldaccepttypes function. when draggin element site , dropping indesign couldaccepttypes function getting invoked , can access mime type "text". when change mime type custom 1 couldaccepttypes function never invoked on mac. instance:

function drag(ev) {

  ev.datatransfer.setdata("mycustommimetype", ev.target.id);

}

 

on windows works fine. tried add standard mime type custom mim too:

function drag(ev) {

  ev.datatransfer.setdata("text", ev.target.id);

  ev.datatransfer.setdata("mycustommimetype", ev.target.id);

}

 

after couldaccepttypes invoked can find "text" flavour, nothing else. on windows both flavours.

 

could point me way handle custom external flavours in indesign on mac if possible. thanks!

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