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Dump of request and response (have the same problem):

Request:

PROPPATCH <a href="https://[REDACTED]/dav.php/%40Home/%D0%90%D0%B2%D0%B4%D0%BE%D0%BD%D0%B8%D0%BD%20%D0%A1.%D0%92..jpg" class="redactor-autoparser-object">https://[REDACTED]/dav.php/%40Home/%D0%90%D0%B2%D0%B4%D0%BE%D0%BD%D0%B8%D0%BD%20%D0%A1.%D0%92..jpg</a> HTTP/1.1
Cache-Control: no-cache
Connection: Keep-Alive
Pragma: no-cache
Content-Type: text/xml; charset="utf-8"
User-Agent: Microsoft-WebDAV-MiniRedir/10.0.18363
If: (<5f401544e6b94>)
translate: f
Content-Length: 443
Host: [REDACTED]
Authorization: Basic [REDACTED]

<?xml version="1.0" encoding="utf-8" ?><d:propertyupdate xmlns:d="DAV:" xmlns:z="urn:schemas-microsoft-com:"><d:set><d:prop><z:win32creationtime>Fri, 21 Aug 2020 18:41:08 GMT</z:win32creationtime><z:win32lastaccesstime>Fri, 21 Aug 2020 18:41:08 GMT</z:win32lastaccesstime><z:win32lastmodifiedtime>Fri, 21 Aug 2020 18:41:08 GMT</z:win32lastmodifiedtime><z:win32fileattributes>00002020</z:win32fileattributes></d:prop></d:set></d:propertyupdate>

Response:

HTTP/1.1 501 Not Implemented
Content-Length: 0
Content-Type: text/html; charset=UTF-8
Date: Fri, 21 Aug 2020 18:41:09 GMT
Server: Apache/2.4.25 (Debian)
X-Webdav-Status: 501 Method Not Implemented

May be FileRun does not understand this <Win32CreationTime> (and other win32-) tags?