Create a folder in your Plex data folder called Profiles.
Create a file and Insert this code into the file and name it iOS.xml.
Save the file in the created Profile folder.
Restart your server.
<?xml version="1.0" encoding="utf-8"?>
<Client name="iOS">
<!-- Author: Plex Inc. -->
<!-- This profile is used by A5 and higher devices (starting with iPhone 4S and iPad 3) -->
<Settings>
<Setting name="DirectPlayStreamSelection" value="true" />
<Setting name="StreamUnselectedIncompatibleAudioStreams" value="true" />
</Settings>
<TranscodeTargets>
<VideoProfile container="mp4" codec="h264" audioCodec="aac" subtitleCodec="mov_text" context="static" />
<VideoProfile protocol="hls" container="mp4" codec="h264" audioCodec="aac,ac3,eac3" subtitleCodec="eia_608_embedded" context="streaming" />
<VideoProfile protocol="hls" container="mp4" codec="hevc" audioCodec="aac,ac3,eac3" subtitleCodec="eia_608_embedded" context="streaming" />
<MusicProfile container="mp4" codec="aac" />
<PhotoProfile container="jpeg" />
<SubtitleProfile protocol="hls" container="webvtt" subtitleCodec="webvtt"/>
</TranscodeTargets>
<DirectPlayProfiles>
<VideoProfile container="mp4" codec="h264" audioCodec="aac,ac3,eac3,mp3" subtitleCodec="mov_text,tx3g,ttxt,text" />
<VideoProfile container="mp4" codec="hevc" audioCodec="aac,ac3,eac3,mp3" subtitleCodec="mov_text,tx3g,ttxt,text" />
<VideoProfile container="mov" codec="h264" audioCodec="aac,ac3,eac3,mp3" subtitleCodec="mov_text,tx3g,ttxt,text" />
<!-- Allow Direct Play of HLS content -->
<VideoProfile protocol="hls" container="mpegts" codec="h264" audioCodec="aac,ac3,eac3,mp3" />
<VideoProfile protocol="hls" container="mp4" codec="h264" audioCodec="aac,ac3,eac3,mp3" />
<VideoProfile protocol="hls" container="mp4" codec="hevc" audioCodec="aac,ac3,eac3,mp3" />
<MusicProfile container="mp3" codec="mp3" />
<MusicProfile container="mp4" codec="aac" />
<MusicProfile container="mp4" codec="alac" />
<MusicProfile container="flac" codec="flac" />
<PhotoProfile container="jpeg,gif,bmp,png" />
</DirectPlayProfiles>
<CodecProfiles>
<VideoCodec name="h264">
<Limitations>
<UpperBound name="video.width" value="3840" isRequired="true" />
<UpperBound name="video.height" value="2160" isRequired="true" />
<UpperBound name="video.bitDepth" value="8" />
<NotMatch name="video.separateFields" value="1" />
</Limitations>
</VideoCodec>
<VideoCodec name="hevc">
<Limitations>
<UpperBound name="video.width" value="3840" isRequired="true" />
<UpperBound name="video.height" value="2160" isRequired="true" />
<UpperBound name="video.bitDepth" value="10" />
<NotMatch name="video.separateFields" value="1" />
<UpperBound name="video.width" value="1920" onlyTranscodes="true" />
<UpperBound name="video.height" value="1080" onlyTranscodes="true" />
<UpperBound name="video.bitDepth" value="8" onlyTranscodes="true" />
</Limitations>
</VideoCodec>
<VideoAudioCodec name="*">
<Limitations>
<UpperBound name="audio.channels" value="2" onlyTranscodes="true" />
</Limitations>
</VideoAudioCodec>
</CodecProfiles>
</Client>