If you are able to replicate crash at will, you can use ProcDump tool to create crash dump:

• Get Sysinternals ProcDump tool.
• Run procdump.exe -ma -e explorer.exe from command line.
• Replicate the crash. Dump file (explorer.exe_*.dmp) should be created.

In case of random crashes that are hard to replicate, you can instruct Windows to create dump into specified location using Collecting User-Mode Dumps guide:

• Open administrator command prompt
• Run reg add "HKLM\SOFTWARE\Microsoft\Windows\Windows Error Reporting\LocalDumps\explorer.exe" /v DumpType /t REG_DWORD /d 2 /f
• Dumps should be created in %LOCALAPPDATA%\CrashDumps by default

Once you have crash dump, compress it, upload to some cloud storage (OneDrive, GoogleDrive, DropBox, ...) and post a link to it.