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<a href="https://wordpress.org/plugins/nextgen-gallery/" rel="ugc">NextGEN Gallery</a> (NGG) is an excellent gallery for WordPress. Its major drawback, as far as I’m concerned, is the limited possiblity to insert selected images into posts. This image chooser offers a comfortable way to browse through hierarchical albums and galleries, insert NGG tags for albums and galleries, as well as NGG tags for one or more images and thumbnails at a time.
<ul>
<li>On the left side of the image chooser pop-up there is the tree view of all albums and galleries. On the top are the albums and their galleries, then follow the galleries, which are not attached to any album.</li>
<li>On the upper right side there are the controls to insert the tags with their relevant options.</li>
<li>Below the controls, the thumbnails of the images in the selected gallery are shown, optionally together with their title, summary and description. There multiple images can be selected for insertion. </li>
</ul>
Default settings can be altered on the settings page.
At this time, the image chooser is available in English.

Image Chooser Block for NextGEN Gallery

Comfortable Image Chooser Block for the NextGEN Gallery

<a href="https://wordpress.org/plugins/nextgen-gallery/" rel="ugc">NextGEN Gallery</a> (NGG) is an excellent gallery for WordPress. Its major drawback, as far as I’m concerned, is the minimalistic image chooser. So I’ve taken the liberty to adapt the equally excellent <a href="http://g2image.steffensenfamily.com/" rel="nofollow ugc">g2image</a> image chooser, which also is embedded in the WPG2 connector to Gallery2.
This image chooser allows to browse through hierarchical albums and galleries, insert NGG tags for albums and galleries, as well as NGG and HTML tags for one or more images and thumbnails at a time.
<ul>
<li>On the left side of the image chooser pop-up there is the tree view of all albums and galleries. On the top are the albums and their galleries, then follow the galleries, which are not attached to any album.</li>
<li>On the upper right side there are the controls to insert the tags with their relevant options. Depending on which insert mode (NGG or HTML tag, image or thumbnail) is selected, only the relevant options are shown.</li>
<li>Below the controls, the thumbnails of the images in the selected gallery are shown, optionally together with their title, summary and description. There multiple images can be selected for insertion. </li>
</ul>
At present, the NGG tags [album], [nggallery], [thumb], [singlepic], and [imagebrowser], plus some html links are supported.
Default settings can be altered on the settings page.
NOTE: This plugin does not work with the new Gutenberg editor. There now is a new plugin that allows you to insert NGG tags for images, galleries and albums as Gutenberg blocks: <a href="https://de.wordpress.org/plugins/ngg-image-chooser-block/" rel="nofollow ugc">Image Chooser Block for NextGEN Gallery</a>. 
Alternatively you can switch to the classic editor, e.g. by using the <a href="https://wordpress.org/plugins/classic-editor/" rel="ugc">Classic Editor</a> plugin.
At this time, the image chooser is available in English (default) and German. Other translations are welcome and will be included in the next release.

NextGEN Gallery Image Chooser

Comfortable Image Chooser for the NextGEN Gallery, based on g2image

Image Chooser Block for NextGEN Gallery vs NextGEN Gallery Image Chooser