clarkwinkelmann Hi!, I've used both Default Image download template (can download but get no preview) and Complete Image preview template (can't see the image unless I add the period manually).
Here's the flarum info:
Flarum core 0.1.0-beta.15
PHP version: 7.2.34
Loaded extensions: Core, date, libxml, pcre, sqlite3, filter, hash, intl, json, mbstring, SPL, PDO, Reflection, sodium, pdo_sqlite, session, standard, bcmath, bz2, calendar, ctype, curl, dom, exif, fileinfo, ftp, gd, gettext, iconv, imap, mysqlnd, openssl, pcntl, pdo_mysql, zlib, posix, pspell, mysqli, SimpleXML, soap, sockets, tokenizer, xml, xmlreader, xmlrpc, xmlwriter, xsl, zip, Phar, imagick, memcached, Zend OPcache
+----------------------+------------------+--------+
| Flarum Extensions | | |
+----------------------+------------------+--------+
| ID | Version | Commit |
+----------------------+------------------+--------+
| flarum-approval | v0.1.0-beta.15 | |
| flarum-bbcode | v0.1.0-beta.15 | |
| flarum-emoji | v0.1.0-beta.15 | |
| flarum-lang-english | v0.1.0-beta.15 | |
| flarum-flags | v0.1.0-beta.15 | |
| flarum-likes | v0.1.0-beta.15 | |
| flarum-lock | v0.1.0-beta.15 | |
| flarum-markdown | v0.1.0-beta.15 | |
| flarum-mentions | v0.1.0-beta.15 | |
| flarum-statistics | v0.1.0-beta.15 | |
| flarum-sticky | v0.1.0-beta.15.1 | |
| flarum-subscriptions | v0.1.0-beta.15 | |
| flarum-suspend | v0.1.0-beta.15 | |
| flarum-tags | v0.1.0-beta.15 | |
| fof-upload | 0.13.1 | |
+----------------------+------------------+--------+