File Picker UI Host created by Microsoft for Windows operating system software package. PickerHost.exe basically utilizes the EXE file extension file and is known as the Win32 .exe file. Nowadays, you may face an issue in your system, if you have not updated your Windows OS or any application like Mail App. Any corrupt installation of any uncertain App may also cause the File Picker UI host is not responding the issue. This issue mainly occurs when the user tries to attach or download the file by File picker.
As per the reports, this issue mainly occurs in applications like Skype, Mail, etc., but users claim that they have also faced the same problem with their browsers while using them in their system. Therefore, before moving further to fix this issue, you may try a clean boot process to rectify the error or use alternate apps because a clean system is a key requirement to avoid the File Hosting Ui error.
Fix: File Picker UI Host is Not Responding
Method 1: Update Windows and the Apps
One of the main reason for File Picker UI Host is Windows and apps are not updated that may impact incompatibility between apps and Windows OS. However, the update may rectify the issue automatically as the Windows updates the app and the OS itself. Still, in case you can do this process manually, the steps to update Windows are:

