My Server admin fixed the local PDFtk.
Now it says under the hood “PDFTK: /usr/bin/pdftk”

Above you pointed out it should say “PDFTK: YES”.

Is there a way to verify that the plugin does not sent any data to your servers? I was expecting that by activating “Enable local PDFTK” in settings, that the plugin would onyl use local PDFTK and not fall back on your servers if local PDFTK is not working.

Currently it looks like out local PDFTK installation was misconfigured the whole time (>1 year). But our PDF (1 Form, 1 Template) always came out fine.

Can you point out a way to stop make the plugin send out data please?

Thanks,
Felix

UNDER THE HOOD (DOMAIN censored)
##############
Site URL: https://$domain.com/
Plugin folder: formidablepro-2-pdf
PHP version: 7.2.25
WP version: 5.3
FrmAppHelper: Yes
Trial: Yes
PDFTK: /usr/bin/pdftk
System: Linux $domain.com 3.10.0-957.1.3.el7.x86_64 #1 SMP Thu Nov 29 14:49:43 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
CURL: 7.29.0
CURL error: No
CURL test: Yes
PHP Extensions: Core, date, libxml, openssl, pcre, zlib, filter, hash, Reflection, SPL, session, standard, cgi-fcgi, bcmath, bz2, calendar, ctype, curl, dom, mbstring, fileinfo, ftp, gd, gettext, iconv, json, exif, mysqlnd, PDO, Phar, posix, shmop, SimpleXML, sockets, sqlite3, sysvmsg, sysvsem, sysvshm, tidy, tokenizer, xml, xmlwriter, xsl, mcrypt, mysqli, pdo_mysql, pdo_sqlite, wddx, xmlreader, zip, mysql, Zend OPcache
Plugins: comet-cache/comet-cache.php, elementor-pro/elementor-pro.php, elementor/elementor.php, formidable-pro/formidable-pro.php, formidable/formidable.php, formidablepro-2-pdf/fpropdf.php, indeed-membership-pro/indeed-membership-pro.php, post-smtp/postman-smtp.php, redirection/redirection.php, server-ip-memory-usage/server-ip-memory-usage.php, shortcode-in-menus/shortcode-in-menus.php, statify/statify.php, stops-core-theme-and-plugin-updates/main.php, updraftplus/updraftplus.php, wordfence/wordfence.php, wp-add-custom-css/wordpress-add-custom-css.php, wp-security-audit-log/wp-security-audit-log.php

/var/www/$domain.com/wp-content/plugins/formidablepro-2-pdf/fields is writable: Yes
/var/www/$domain.com/wp-content/plugins/formidablepro-2-pdf/fields can have files: Yes
/var/www/$domain.com/wp-content/plugins/formidablepro-2-pdf/fields write successful: Yes
/var/www/$domain.com/wp-content/plugins/formidablepro-2-pdf/fields delete successful: Yes
/tmp is writable: Yes
/tmp can have files: Yes
/tmp write successful: Yes
/tmp delete successful: Yes
/var/www/$domain.com/wp-content/uploads/fpropdf-forms is writable: Yes
/var/www/$domain.com/wp-content/uploads/fpropdf-forms can have files: Yes
/var/www/$domain.com/wp-content/uploads/fpropdf-forms write successful: Yes
/var/www/$domain.com/wp-content/uploads/fpropdf-forms delete successful: Yes