concrete5 Environment Information
# concrete5 Version
Core Version - 5.7.3.1
Version Installed - 5.7.3.1
Database Version - 20150109000000
# concrete5 Packages
Likes This! (2.0.1), ProEvents (2.2.1), Quick Pay (1.0.1), Responsive Embed (1.0.0), Touch Gallery (2.0.4), Zoomer (1.0.1).
# concrete5 Overrides
blocks/autonav, languages/sl_SI, languages/fi_FI, languages/ja_JP, languages/sv_SE, languages/nl_NL, languages/el_GR, languages/it_IT, languages/fr_FR, languages/de_DE, languages/ru_RU, languages/tr_TR, languages/da_DK, themes/ef
# concrete5 Cache Settings
Block Cache - Off
Overrides Cache - Off
Full Page Caching - Off
Full Page Cache Lifetime - Every 6 hours (default setting).
# Server Software
Apache
# Server API
cgi-fcgi
# PHP Version
5.3.29
# PHP Extensions
bcmath, bz2, calendar, cgi-fcgi, Core, ctype, curl, date, dom, ereg, exif, ffmpeg, fileinfo, filter, ftp, gd, geoip, gettext, hash, iconv, imagick, imap, intl, ionCube Loader, json, libxml, mbstring, mcrypt, memcache, mysql, mysqli, openssl, pcre, PDO, pdo_mysql, pdo_pgsql, pdo_sqlite, pgsql, Phar, posix, pspell, rar, Reflection, session, SimpleXML, soap, sockets, SourceGuardian, SPL, SQLite, sqlite3, standard, stats, tokenizer, uploadprogress, wddx, xml, xmlreader, xmlrpc, xmlwriter, xsl, yaml, Zend Guard Loader, zip, zlib.
# PHP Settings
max_execution_time - 1800
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 1800
max_input_vars - 1000
memory_limit - 512M
post_max_size - 512M
safe_mode - Off
safe_mode_exec_dir - /usr/local/php/bin
safe_mode_gid - Off
safe_mode_include_dir - <i>no value</i>
sql.safe_mode - Off
upload_max_filesize - 512M
memcache.max_failover_attempts - 20
mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
pgsql.max_links - Unlimited
pgsql.max_persistent - Unlimited
session.cache_limiter - <i>no value</i>
session.gc_maxlifetime - 1440
soap.wsdl_cache_limit - 5
safe_mode_allowed_env_vars - PHP_
safe_mode_protected_env_vars - LD_LIBRARY_PATH
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I am not sure what the problem is since I have no problem batch assigning files to sets but here's how I do it exactly step by step, in case you are missing a step:
1- go to file manager
2- checking boxes for files to assign to the set
3- in the select list that says 'Items selected' select 'sets'
4- a popup appears
5- in the popup select the sets you want or create a new one
6- click the update button
And that's all. It works fine for me.
Let me know if it still doesn't work for you and I'll see how to help you further.