Accessing local files

<?xml version="1.0" encoding="utf-8"?>
<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.unity3d.player"
    xmlns:tools="http://schemas.android.com/tools"
    android:installLocation="preferExternal">
    <supports-screens
        android:smallScreens="true"
        android:normalScreens="true"
        android:largeScreens="true"
        android:xlargeScreens="true"
        android:anyDensity="true"/>
    <application
        android:theme="@style/UnityThemeSelector"
        android:icon="@mipmap/app_icon"
        android:label="@string/app_name">
        <activity android:name="com.unity3d.player.UnityPlayerActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <meta-data android:name="unityplayer.UnityActivity" android:value="true" />
        </activity>
    </application>
 
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

</manifest>

Hello,
I've been having this same problem for a few days. I have a project where I show 360º videos. They were working correctly a few weeks ago and now they are not. I think I'm having problems with the access permissions to read the videos inside the "/storage/emulated/0/Videos" that I put manually through a string. Any suggestions to try to fix the problem?