Hi AialexanderPsoih,
Thank you for taking the time to post a report. However, re-import issues have been known for some time. The system has recently been re-done to make this much more effective. You can take a look at the feature post here: Engine Features Preview 2/13/2015 - Announcements - Epic Developer Community Forums
I’ve just tested this with 4.7 preview 8 and all has worked well for me. Any FBX assets that are saved in your Content Folder will be automatically imported with the import options opening as soon as the file is saved there. If you adjust the source file it will automatically update without the need to select the re-import option.