Created attachment 130370 [details]
screenshot of the bug pop up window

SUMMARY


STEPS TO REPRODUCE
1. Open an image(jpg for example)using open file button
2. Make new layer
3. Open saving dialoge box using save button on toolbar
4. The box "also save your image as Krta file" should be checked
5. Click ok

EXPECTED RESULT
the dialogue box stating that "An unspecified error occurred." will pop up.
Screenshot provided in attachment

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 5.12.8

ADDITIONAL INFORMATION
the issue can be worked around when saving using: file>save as>krita document

System Information

Krita

 Version: 4.3.1-alpha (git 8798b4d)
 Languages: C
 Hidpi: true

Qt

  Version (compiled): 5.12.8
  Version (loaded): 5.12.8

OS Information

  Build ABI: arm64-little_endian-lp64
  Build CPU: arm64
  CPU: arm64
  Kernel Type: linux
  Kernel Version: 4.4.205-18876299
  Pretty Productname: Android  (10.0)
  Product Type: android
  Product Version: 10.0
  Desktop: 

OpenGL Info
 
  Vendor:  "Qualcomm" 
  Renderer:  "Adreno (TM) 540" 
  Version:  "OpenGL ES 3.2 V@415.0 (GIT@339f197, I04d54ab9d9, 1589976200) (Date:05/20/20)" 
  Shading language:  "OpenGL ES GLSL ES 3.20" 
  Requested format:  QSurfaceFormat(version 2.0, options QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile  QSurfaceFormat::NoProfile) 
  Current format:    QSurfaceFormat(version 3.2, options QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples 0, swapBehavior QSurfaceFormat::DefaultSwapBehavior, swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile  QSurfaceFormat::NoProfile) 
     Version: 3.2
     Supports deprecated functions false 
     is OpenGL ES: true 

QPA OpenGL Detection Info 
  supportsDesktopGL: false 
  supportsOpenGLES: true 
  isQtPreferOpenGLES: true 

Hardware Information

  GPU Acceleration: angle
  Memory: 3589 Mb
  Number of Cores: 8
  Swap Location: /data/data/org.krita/files

Current Settings

  Current Swap Location: /data/data/org.krita/files
  Current Swap Location writable: true
  Undo Enabled: true
  Undo Stack Limit: 30
  Use OpenGL: true
  Use OpenGL Texture Buffer: true
  Use AMD Vectorization Workaround: false
  Canvas State: OPENGL_SUCCESS
  Autosave Interval: 900
  Use Backup Files: true
  Number of Backups Kept: 1
  Backup File Suffix: ~
  Backup Location: Same Folder as the File
  Backup Location writable: false
  Use Win8 Pointer Input: false
  Use RightMiddleTabletButton Workaround: false
  Levels of Detail Enabled: false
  Use Zip64: false


Display Information
Number of screens: 1
	Screen: 0
		Name: 
		Depth: 32
		Scale: 2.24978
		Resolution in pixels: 1138x696
		Manufacturer: 
		Model: 
		Refresh Rate: 60