Threema for Android now features image quick select *, which allows to send images in a snap. Simply tap the paperclip icon to invoke the attachments popup, and you're presented with your gallery's most recent images and animated GIFs. Select one, and you're done. Should you have trouble finding the right image, tap and hold a thumbnail, and it will expand to a preview of the image. If you prefer to, you can disable image quick select completely in Settings > Chats.
Furthermore, design and usability of the chat view have been overhauled and unified. For example, captions are no longer shown as overlay, they are appended below images, and no matter the format, all media types are now neatly displayed in the same manner.
Besides the chat view, many other areas of the app have been improved, both visually and in terms of usability. We think you'll like Threema 2.82 for Android.
*requires Android 4.1 or higher