Many connections from Android clients to Photo Upload directory

Hi. This spring Android clients has been auto upgraded. One moment I saw many connections:

As you can see in logs below there are many connections to Photo Upload directory from client. Same situation with other clients. Never see this before Spring 2021. Server version: 7.0.5, installed in Autumn 2020.

NGINX logs:

46.174.115.1 - - [03/Jun/2021:22:24:53 +0300] “GET /api2/repos/5caa1b98-94e7-4371-9ce4-0d5a87775cde/dir/?p=My+Photos%2FCamera&oid=520013ccc12b9d526a781fbbb1db9a467e2f0ab1 HTTP/1.1” 2
00 10 “-” “Dalvik/2.1.0 (Linux; U; Android 10; Mi A2 Build/QKQ1.190910.002)”
46.174.115.1 - - [03/Jun/2021:22:24:53 +0300] “GET /api2/repos/5caa1b98-94e7-4371-9ce4-0d5a87775cde/dir/?p=My+Photos&oid=c837808fa6e59296d5d36b4ac9e4ffa29fb3d067 HTTP/1.1” 200 10 “-”
“Dalvik/2.1.0 (Linux; U; Android 10; Mi A2 Build/QKQ1.190910.002)”
46.174.115.1 - - [03/Jun/2021:22:24:53 +0300] “GET /api2/repos/5caa1b98-94e7-4371-9ce4-0d5a87775cde/dir/?p=My+Photos%2FCamera&oid=520013ccc12b9d526a781fbbb1db9a467e2f0ab1 HTTP/1.1” 2
00 10 “-” “Dalvik/2.1.0 (Linux; U; Android 10; Mi A2 Build/QKQ1.190910.002)”
46.174.115.1 - - [03/Jun/2021:22:24:54 +0300] “GET /api2/repos/5caa1b98-94e7-4371-9ce4-0d5a87775cde/dir/?p=My+Photos&oid=c837808fa6e59296d5d36b4ac9e4ffa29fb3d067 HTTP/1.1” 200 10 “-”
“Dalvik/2.1.0 (Linux; U; Android 10; Mi A2 Build/QKQ1.190910.002)”
46.174.115.1 - - [03/Jun/2021:22:24:54 +0300] “GET /api2/repos/5caa1b98-94e7-4371-9ce4-0d5a87775cde/dir/?p=My+Photos%2FCamera&oid=520013ccc12b9d526a781fbbb1db9a467e2f0ab1 HTTP/1.1” 2
00 10 “-” “Dalvik/2.1.0 (Linux; U; Android 10; Mi A2 Build/QKQ1.190910.002)”
46.174.115.1 - - [03/Jun/2021:22:24:54 +0300] “GET /api2/repos/5caa1b98-94e7-4371-9ce4-0d5a87775cde/dir/?p=My+Photos&oid=c837808fa6e59296d5d36b4ac9e4ffa29fb3d067 HTTP/1.1” 200 10 “-”
“Dalvik/2.1.0 (Linux; U; Android 10; Mi A2 Build/QKQ1.190910.002)”
46.174.115.1 - - [03/Jun/2021:22:24:55 +0300] “GET /api2/repos/5caa1b98-94e7-4371-9ce4-0d5a87775cde/dir/?p=My+Photos%2FCamera&oid=520013ccc12b9d526a781fbbb1db9a467e2f0ab1 HTTP/1.1” 2
00 10 “-” “Dalvik/2.1.0 (Linux; U; Android 10; Mi A2 Build/QKQ1.190910.002)”
46.174.115.1 - - [03/Jun/2021:22:24:55 +0300] “GET /api2/repos/5caa1b98-94e7-4371-9ce4-0d5a87775cde/dir/?p=My+Photos&oid=c837808fa6e59296d5d36b4ac9e4ffa29fb3d067 HTTP/1.1” 200 10 “-”
“Dalvik/2.1.0 (Linux; U; Android 10; Mi A2 Build/QKQ1.190910.002)”
46.174.115.1 - - [03/Jun/2021:22:24:56 +0300] “GET /api2/repos/5caa1b98-94e7-4371-9ce4-0d5a87775cde/dir/?p=My+Photos%2FCamera&oid=520013ccc12b9d526a781fbbb1db9a467e2f0ab1 HTTP/1.1” 2
00 10 “-” “Dalvik/2.1.0 (Linux; U; Android 10; Mi A2 Build/QKQ1.190910.002)”
46.174.115.1 - - [03/Jun/2021:22:24:56 +0300] “GET /api2/repos/5caa1b98-94e7-4371-9ce4-0d5a87775cde/dir/?p=My+Photos&oid=c837808fa6e59296d5d36b4ac9e4ffa29fb3d067 HTTP/1.1” 200 10 “-”
“Dalvik/2.1.0 (Linux; U; Android 10; Mi A2 Build/QKQ1.190910.002)”
46.174.115.1 - - [03/Jun/2021:22:24:57 +0300] “GET /api2/repos/5caa1b98-94e7-4371-9ce4-0d5a87775cde/dir/?p=My+Photos%2FCamera&oid=520013ccc12b9d526a781fbbb1db9a467e2f0ab1 HTTP/1.1” 2
00 10 “-” “Dalvik/2.1.0 (Linux; U; Android 10; Mi A2 Build/QKQ1.190910.002)”
46.174.115.1 - - [03/Jun/2021:22:24:57 +0300] “GET /api2/repos/5caa1b98-94e7-4371-9ce4-0d5a87775cde/dir/?p=My+Photos&oid=c837808fa6e59296d5d36b4ac9e4ffa29fb3d067 HTTP/1.1” 200 10 “-”
“Dalvik/2.1.0 (Linux; U; Android 10; Mi A2 Build/QKQ1.190910.002)”
46.174.115.1 - - [03/Jun/2021:22:24:57 +0300] “GET /api2/repos/5caa1b98-94e7-4371-9ce4-0d5a87775cde/dir/?p=My+Photos%2FCamera&oid=520013ccc12b9d526a781fbbb1db9a467e2f0ab1 HTTP/1.1” 2
00 10 “-” “Dalvik/2.1.0 (Linux; U; Android 10; Mi A2 Build/QKQ1.190910.002)”
46.174.115.1 - - [03/Jun/2021:22:24:58 +0300] “GET /api2/repos/5caa1b98-94e7-4371-9ce4-0d5a87775cde/dir/?p=My+Photos&oid=c837808fa6e59296d5d36b4ac9e4ffa29fb3d067 HTTP/1.1” 200 10 “-”
“Dalvik/2.1.0 (Linux; U; Android 10; Mi A2 Build/QKQ1.190910.002)”
46.174.115.1 - - [03/Jun/2021:22:24:58 +0300] “GET /api2/repos/5caa1b98-94e7-4371-9ce4-0d5a87775cde/dir/?p=My+Photos%2FCamera&oid=520013ccc12b9d526a781fbbb1db9a467e2f0ab1 HTTP/1.1” 2
00 10 “-” “Dalvik/2.1.0 (Linux; U; Android 10; Mi A2 Build/QKQ1.190910.002)”