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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
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Remember, the below information may be requested if it isn’t supplied; for fastest response please provide as much as you can 
Please delete everything above when creating your topic and provide the following:
Nextcloud version (eg, 12.0.2): 13.01 or 12.06
Operating system and version (eg, Ubuntu 17.04): Raspbian stretch as well as Ubuntu 16.04
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.25
PHP version (eg, 7.1): 7.0.27
The issue you are facing:
Encrypted files stored in Amazon S3 bucket (mounted as external storage) cannot be downloaded/decrypted.
Steps to replicate it:
- Install a new instance of nextcloud 13.01 or 12.06
- Enable “default encryption” and “external storage” apps
- Connect Amazon S3 storage as external drive (After log out and log back in).
- Upload is successful but download fails.
- If I disable encryption everything works as expected.
The output of your Nextcloud log in Admin > Logging:
Error PHP Uncaught Error: Access to undeclared static property: OC\Files\Filesystem::$normalizedPathCache in /home/pi/website/nextcloud/lib/private/Files/Filesystem.php:796 Stack trace: #0 /home/pi/website/nextcloud/lib/private/Files/View.php(2057): OC\Files\Filesystem::normalizePath('/aparanjape/fil...') #1 /home/pi/website/nextcloud/lib/private/Files/View.php(1182): OC\Files\View->unlockFile('/AWS Storage/CM...', 1) #2 [internal function]: OC\Files\View->OC\Files\{closure}() #3 /home/pi/website/nextcloud/apps/files_external/3rdparty/icewind/streams/src/CallbackWrapper.php(109): call_user_func(Object(Closure)) #4 [internal function]: Icewind\Streams\CallbackWrapper->stream_close() #5 {main} thrown at /home/pi/website/nextcloud/lib/private/Files/Filesystem.php#796 2018-03-24T12:11:31-0700
Error no app in context OC\Encryption\Exceptions\DecryptionFailedException: Encryption library: Decryption (symmetric) of content failed:
/home/pi/website/nextcloud/apps/encryption/lib/Crypto/Crypt.php - line 471: OCA\Encryption\Crypto\Crypt->decrypt(*** sensitive parameters replaced ***)
/home/pi/website/nextcloud/apps/encryption/lib/Crypto/Encryption.php - line 380: OCA\Encryption\Crypto\Crypt->symmetricDecryptFileContent('ZbZQtv4impawB7Y...', '\xC7\x034\xF9\xDE\xF72*\xF9\xBC\xB8\xD1\xA6\x9Bu...', 'AES-256-CTR', 1, 0)
/home/pi/website/nextcloud/lib/private/Files/Stream/Encryption.php - line 464: OCA\Encryption\Crypto\Encryption->decrypt(*** sensitive parameters replaced ***)
/home/pi/website/nextcloud/lib/private/Files/Stream/Encryption.php - line 295: OC\Files\Stream\Encryption->readCache()
[internal function] OC\Files\Stream\Encryption->stream_read(8192)
/home/pi/website/nextcloud/apps/files_external/3rdparty/icewind/streams/src/Wrapper.php - line 83: fread(Resource id #71, 8192)
/home/pi/website/nextcloud/apps/files_external/3rdparty/icewind/streams/src/CallbackWrapper.php - line 91: Icewind\Streams\Wrapper->stream_read(8192)
[internal function] Icewind\Streams\CallbackWrapper->stream_read(8192)
/home/pi/website/nextcloud/lib/private/Files/View.php - line 425: fread(Resource id #74, 8192)
/home/pi/website/nextcloud/lib/private/legacy/files.php - line 310: OC\Files\View->readfile('/AWS Storage/CM...')
/home/pi/website/nextcloud/lib/private/legacy/files.php - line 122: OC_Files getSingleFile(Object(OC\Files\View), '/AWS Storage', 'CMA_53000_03162...', Array)
/home/pi/website/nextcloud/apps/files/ajax/download.php - line 64: OC_Files get('/AWS Storage', 'CMA_53000_03162...', Array)
/home/pi/website/nextcloud/lib/private/Route/Route.php - line 155: require_once('/home/pi/websit...')
[internal function] OC\Route\Route->OC\Route\{closure}(*** sensitive parameters replaced ***)
/home/pi/website/nextcloud/lib/private/Route/Router.php - line 297: call_user_func(Object(Closure), Array)
/home/pi/website/nextcloud/lib/base.php - line 998: OC\Route\Router->match('/apps/files/aja...')
/home/pi/website/nextcloud/index.php - line 37: OC handleRequest()
{main}
2018-03-24T12:11:27-0700
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'ocx2vv7alr00',
'passwordsalt' => xxxx',
'secret' => 'xxxxxx',
'trusted_domains' =>
array (
0 => 'xxxxx',
),
'datadirectory' => '/home/pi/serverHome',
'overwrite.cli.url' => 'xxxxx',
'dbtype' => 'mysql',
'version' => '13.0.1.1',
'dbname' => 'serverDB',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'nextcloud_db_user',
'dbpassword' => 'xxxx',
'installed' => true,
'loglevel' => 0,
'maintenance' => false,
'memcache.local' => '\\OC\\Memcache\\Redis',
'filelockin.enabled' => true,
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => 'localhost',
'port' => 6379,
),
);
The output of your Apache/nginx/system log in /var/log/____:
[Sun Mar 25 08:52:15.318741 2018] [core:notice] [pid 32624] AH00094: Command line: '/usr/sbin/apache2'
[Sun Mar 25 09:10:10.919565 2018] [:error] [pid 32628] [client xxxx] PHP Fatal error: Uncaught Error: Access to undeclared static property: OC\\Files\\Filesystem::$normalizedPathCache in /home/pi/website/nextcloud_13_01/lib/private/Files/Filesystem.php:804\nStack trace:\n#0 /home/pi/website/nextcloud_13_01/lib/private/Files/View.php(2062): OC\\Files\\Filesystem::normalizePath('/aparanjape/fil...')\n#1 /home/pi/website/nextcloud_13_01/lib/private/Files/View.php(1193): OC\\Files\\View->unlockFile('/AmazonS3/CMA_5...', 1)\n#2 [internal function]: OC\\Files\\View->OC\\Files\\{closure}()\n#3 /home/pi/website/nextcloud_13_01/apps/files_external/3rdparty/icewind/streams/src/CallbackWrapper.php(109): call_user_func(Object(Closure))\n#4 [internal function]: Icewind\\Streams\\CallbackWrapper->stream_close()\n#5 {main}\n thrown in /home/pi/website/nextcloud_13_01/lib/private/Files/Filesystem.php on line 804
[Sun Mar 25 09:11:11.225989 2018] [:error] [pid 2199] [client xxxx] PHP Fatal error: Uncaught Error: Access to undeclared static property: OC\\Files\\Filesystem::$normalizedPathCache in /home/pi/website/nextcloud_13_01/lib/private/Files/Filesystem.php:804\nStack trace:\n#0 /home/pi/website/nextcloud_13_01/lib/private/Files/View.php(2062): OC\\Files\\Filesystem::normalizePath('/aparanjape/fil...')\n#1 /home/pi/website/nextcloud_13_01/lib/private/Files/View.php(1193): OC\\Files\\View->unlockFile('/AmazonS3/CMA_5...', 1)\n#2 [internal function]: OC\\Files\\View->OC\\Files\\{closure}()\n#3 /home/pi/website/nextcloud_13_01/apps/files_external/3rdparty/icewind/streams/src/CallbackWrapper.php(109): call_user_func(Object(Closure))\n#4 [internal function]: Icewind\\Streams\\CallbackWrapper->stream_close()\n#5 {main}\n thrown in /home/pi/website/nextcloud_13_01/lib/private/Files/Filesystem.php on line 804