The Book

http://bartsimons.me/manually-add-files-to-owncloud/

First, find your data folder

find / -name config.php 2>/dev/null | while read line ; do cat "$line" | grep " 'datadirectory'" ; done

Now cd to the folder

OwnCloud:

cd /var/www/owncloud/data

NextCloud:

cd /mnt/ncdata

Check the folder content

ls -all

Find the users folder (cd again to it) find the files folder (cd again to it) and create a new folder within or move/copy files here

mkdir testfolder

Moving a file/folder (or creating a new folder) into ownCloud's data directory doesn't add it to the database automatically. Now you should use a CLI tool called occ that can manually add missing files and folders to the ownCloud database. So, check where th e utility is located:

find / -name "occ" 2>/dev/null

Change to folder in which occ was discovered:

OwnCloud:

cd /var/www/owncloud

NextCloud:

cd /var/www/nextcloud

…and start occ to scan users folder

sudo -u www-data php occ files:scan --all

this is how the output should look like

root@owncloud:/var/www/owncloud# sudo -u www-data php occ files:scan --all

Scanning files for 6 users
Starting scan for user 1 out of 6 (admin)
Starting scan for user 2 out of 6 (xxxxx1)
Starting scan for user 3 out of 6 (yyyyy2)
Starting scan for user 4 out of 6 (zzzzz3)
Starting scan for user 5 out of 6 (aaaaa4)
Starting scan for user 6 out of 6 (bbbbb5)

+---------+--------+--------------+
| Folders | Files  | Elapsed time |
+---------+--------+--------------+
| 24076   | 150551 | 00:03:01     |
+---------+--------+--------------+

Now, the folder you have just created will appear in your web client…