I recorded earlier in the season this huge but elusive object, and I came back to it with an upgraded rig, including a cooled camera and a more selective narrowband filter. This second take is clearly superior to the first one. The field this time includes a second, rare, supernova remnant (SNR) and a nice but not documented molecular cloud, the [MML2017]3737, plus the M56 Globular Cluster celebrity, probably a residual of a captured dwarf galaxy. Many planetary nebulae are visible and annotated.

SNR G065.2+05.7
The picture covers the sky-scape of south Cygnus just north of Albireo, and the undisputed main character is the huge supernova remnant SNR G065.2+05.7, that covers an area of approximately 5 x 3 degrees (that is 6 x 10 moon diameters). It is an authentic "invisible elephant in the room": I observed this area many times without knowing that this giant was sitting there just in front of my eyes. Only it is too faint to be seen, and even in narrowband pictures its signal is extremely weak. The brighter portions of it have been numbered separately as Sh2-91, 94 and maybe 96.
It was detected as a single object by Gull et alii in 1977 during an optical survey. Estimates of its linear diameter is ~70 pc (230 ly) and its distance is 0.8+-0.2 kpc (~2600 ly). It age is about 20000 years.
The Ha and OIII signals are remarkably different, and the Ha is mixing up with the emission background. The second article quoted below states that SNR G065.2+05.7 is an example of a barrel–shaped supernova remnant. Initially I thought that the Sh2-96 was a "Champagne flow" area of the supernova, but I have found no statement about that, but now I changed my mind and I even suspect that it is not part of the supernova, but a background structure.
Interesting are the 2002 article by the University of Crete, Physics Department and this other. A nice page has been dedicated to this SNR by Stephane Zoll.
I came to know about this object and I was inspired by the beautiful image of @Walter Leonhard Schramböck.

Sh2-91, Sh2-94 and Sh2-96
As already mentioned these are all filaments of the supernova remnant SNR G065.2+05.7, with some doubt regarding Sh2-96 (see above).

NGC6846
It is an open cluster located 4700ly away from earth.

Sh2-98
This is a ring nebula associated with a 3000 solar mass molecular cloud and the Wolf-Rayet star WR 130.

SNR G067.6+0.9 (Rarity)
Discovered in 2013, this is the announcement paper https://www.researchgate.net/publication/235258374_New_Galactic_supernova_remnants_discovered_with_IPHAS

Sh2-97
It is ionized by at least four stars - two B1V, one B0.5V and one with a spectral type between O9V and B0V.
It appears to have a bubble-like structure in infrared.

NGC6834
It is an open cluster placed at about 10000 ly.

NGC6842
It is a PN situated at 1300 pc, also known as PK065+0.1

[MML2017]3737 Molecular Cloud (Rarity)
Miville-Deschenes+Murray+Lee, 2017, Catalog of N=8107 molecular clouds that covers the entire Galactic plane.
I have not found any other identificator or data for this colored structure well visible close to the low left border of the image.

Sh2-92
Sh2-92 is ionized by the Wolf-Rayet star WR 127, a binary star with an O9V companion.

M56
M56 is a famous globular cluster in the constellation Lyra. It is located about midway between Albireo and Gamma Lyrae. M56 is about 32900 light-years away from Earth and measures roughly 84 light-years across, containing 230,000 solar masses. It is about 31–32 kly from the Galactic Center and 4.8 kly above the galactic plane. This cluster has an estimated age of 13.70 billion years and is following a retrograde orbit through the Milky Way, suggesting it may have been acquired during the merger of a dwarf galaxy, of which Omega Centauri forms the surviving nucleus. M56 is part of the Gaia Sausage, the hypothesised remains of this merged dwarf.