Symptoms- WordPress instance is having issues uploading PDF files:
AH01071: Got error 'PHP message: ImagickException: Unable to read image blob; PHP
message: Upload failed: String binary is zero after processing image' - Plesk is using Debian/Ubuntu
CauseThe ghostscript package is missing.
Resolution- Connect to the Plesk server via SSH.
- Execute command:
#apt-get install ghostscript