got the idea about problem, it is perhaps because, the contact form itself not sending my field data, in network section, I can see
------WebKitFormBoundaryyUR7aqI54KTjtgdZ
Content-Disposition: form-data; name="your-multifile[]"; filename=""
Content-Type: application/octet-stream
filename is empty that should content file names. It seems unrelated to this plugin, but still if possible please consider giving me some idea how I can achieve this .
Update
removing the bluimp jquery plugin and just adding multifile field sending the data, but that are not included in mail even after adding those into mail settings
Update
I added hidden field and that are saved by flamingo. so if I will be able to send those attachment in mail they will be saved. please give your views and idea, whenever it is possible for you.
ok, by adding replaceFileInput: false now I can see in network section, my multi-field is sending files when form is submitted, but still flamingo not saving these files, neither it is saving default contactform7 file, but it is saving name, that is enough, I would like to see names of my files there. may be need some configuration in contact form edit > additional settings .
got the idea wpcf7_validate_multifile filter will do the job, I will try to make it work, if there is any example or snippet please let me know, that will be great.