With the expansion of the use of unmanned aerial vehicles and their growing application in various industries, given their characteristics, they are becoming interesting in the field of digital forensics due to the possibility of its criminal abuse. As the flight application on a mobile device is often required to manage and use the drones and its features, in forensic terms mobile forensics is becoming very similar to the forensics of drones. With these two digital forensics branches, a significant set of data can be collected by validly selected methods and tools. The biggest challenges are insufficiently standardized methodologies and procedures in performing extraction, vagueness of legal acts, regulations and sophisticated countermeasures to flying activities. The paper provides an overview of the approach to forensic investigation of a commercial unmanned aircraft within the scenario of illegal activities of its use. Also, complexity of the investigation is influenced by factors such as selected tools, methods and used mobile devices, which for greater extraction and analysis success it is recommended to have as much as possible. Currently, there is no standardized approach to digital drones forensic for drones. Combination of different forensic tools gives the best results, which is unfortunately reflected in the lengthy court proceedings.