SUMMARY

STEPS TO REPRODUCE
1. Open Palette Dock ( Settings -> Dockers -> Palette)
2. Click on Load Palette icon (icon with little colored squares)
3.  Select any palette
4. Click "Export current palette to file" (icon with rectangle and arrow outside)
5. In "Export Palette" dialogue navigate to exporting directory
6. Enter export file name if necessary. (example: "palette.kpl")

OBSERVED RESULT
no file is exported

EXPECTED RESULT
palette file in selected directory (as example above: "palette.kpl")

SOFTWARE/OS VERSIONS
Windows: 
  Build ABI: x86_64-little_endian-llp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: winnt
  Kernel Version: 10.0.19044
  Pretty Productname: Windows 10 (10.0)
  Product Type: windows
  Product Version: 10
Qt Version: 
  Version (compiled): 5.12.12
  Version (loaded): 5.12.12

ADDITIONAL INFORMATION
Locale

  Languages: en_US, ru
  C locale: C
  QLocale current: en
  QLocale system: ru
  QTextCodec for locale: UTF-8
  Process ACP: 65001 (UTF-8)
  System locale default ACP: 1251  (ANSI - кириллица)

OpenGL Info
 
  Vendor:  "Google Inc. (NVIDIA)" 
  Renderer:  "ANGLE (NVIDIA, NVIDIA GeForce RTX 3060 Direct3D11 vs_5_0 ps_5_0, D3D11-31.0.15.1694)" 
  Version:  "OpenGL ES 3.0.0 (ANGLE 2.1.0 git hash: f2280c0c5f93+krita_qt5.12.12)" 
  Shading language:  "OpenGL ES GLSL ES 3.00 (ANGLE 2.1.0 git hash: f2280c0c5f93+krita_qt5.12.12)" 
  Requested format:  QSurfaceFormat(version 3.0, options QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile  QSurfaceFormat::CompatibilityProfile) 
  Current format:  QSurfaceFormat(version 3.0, 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: 3.0
     Supports deprecated functions false 
     is OpenGL ES: true 
  supportsBufferMapping: true 
  supportsBufferInvalidation: false 
  forceDisableTextureBuffers: true