Hello
Greetings for the day !!!
As per my understanding you are looking for a Drupal Expert who can assist you on Module tracks which downloads of attached private files.
I can customize its any kind of an existing module,plugin,functionality & also can develop new one as per the requirement.
I have an experience of working with features/modules like content types, fields, blocks, views, wysiwyg editors, media (eg. images, documents), users, roles, permissions.
I am a Professional Drupal Developer with having a strong 7 years of an Experience.I have worked on its various versions such as D5,D6,D7 & Now currently working on D8.
It will be fruitful if we can go for a chat to discuss more in detail.
Kind Regards
HS Virasat Solutions